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>>11491489
Rest of the comic can be found here.
https://rule34.xxx/index.php?page=post&s=list&tags=parent:8815099

>>11491489
I always enjoy people breaking this down, though it's usually more interesting than erotic to me. It's more getting to see how someone sees sex and gender, and inserts another one into the formula, and what that says about the mind of the people doing it

in this i would love to have a secondary adenal gands over the testies and overies as it would help in rejection of the bodys as it would have its own drip of the hormones need to grow.

I like this sorta stuff because I like creating a biologically sound premise for why futas would be fucking males.

Man, I have mixed feelings about that shit. I have contemplated it in the past, and my general outlook is like this:
1) For biolore for futas to be practical is actually way more complicated than what people initially assume
2) If you're actually trying to go in deep, you should really go in deep, i.e. no "uh futas are like a third gender and they're like... really special..." because the audience for futa biolore is autists
3) If you just want fun futa stuff, you should not aim at autists, if you want autistic futa stuff, aim hard and only at autists

Expanding on point one:
Let's assume a few "goals" for our lore.
1) Futas are distinctly "a third gender". There are not "women but different", genetically. A child is born male, female, or futa, and there are no in-betweens.
2) Futas can both bear and sire children.
3) Futas can both bear and sire children of any gender - i.e. a child of a futa has a chance to be of all three genders.
4) A male and a female pairing can also sometimes result in a futa child being born.

>>11491876
Those goals already create a ton of complexity. We only have two sexual chromosomes to work with, an X-(?) pair. XX makes females, XY makes males. Many just create a Z chromosome and call it a day; "Futa is just XZ". But this is already bad for a few reasons.
1) During fetal development, the X chromosome is the one that encodes sexual characteristics. In women, the second X chromosome will "finish" the work of the first; in males, the Y "interjects" and repurposes the work to create the male reproductive system instead. Proto-ovaries become testicles, the protovagina closes up (creating the ridge between the balls and the anus), the protoclitoris develops into the penis, and so on. This doesn't work for futas. Futas need to have both to begin with; it means that the "initial" sex chromosome could not be X, it needs to be something else. "Well just make the Z (futa) chromosome be the starter, and it works", but not quite, because we still have problems - specifically, about potential combinations.

>>11491877
Remember goal three of our initial list. Children of all three sexes, distinct from one another. Let's assume a futa is XZ-coded, or ZX, whatever. Gametes only carry one gendered chromosome. The egg always carries an X chromosome, but the sperm can carry both a Y and an X chromosome. What about a futa's sperm? Z and X follow naturally, but that means that futas can only have daughters and other futas with women, but technically any gender of child with a male... but it creates aberrant combinations - an ZY chromosome mix. What is it? Also a futa, but more... mannish? Just a regular futa? Hard to say.
The most bizarre combination is futa on futa, because it can create, once again, only daughters and futas, but also the aberrant ZZ-chromosome futa. Yeah, you could handwave away all of those additional combinations, and I suppose that people who specifically want male degradation would actually like that reading, because futas inherently reduce male birth by being present in the gene pool. But I'm a different kind of autist, I like options, I like more potential, not less potential.

>>11491879
Additionally, in none of those cases can a futa be born from a pair of normally gendered parents, since the Z chromosome always presents first, before the X chromosome (due to the need of special gonad development for the twin pair).

To cope with this, I introduced the concept of the revolver chromosome. A futa is indeed encoded through a third type of gendered chromosome, I'll keep calling it Z, but they are special in the sense that they carry additional genetic information that can be replaced are slotted in and out depending on the chemical markers of the second gamete during the crossing over state of fertilization. What it essentially means is that futas are characterized by a special chromosome that can work as any of the other chromosomes depending on chemical context; the Z chromosome can present as a pure Z (making a futa), but it can also slot as an X or a Y depending on the situation. Despite that, however, it will still carry the additional genes even across generations.
Why make it so complex? I will now explain, heed my autism.

>>11491882
Essentially, to fulfill the initial goals I've described above.

Goal 1 is fulfilled by requiring futas to have a distinct, specific chromosome for their development. A simple Z chromosome would do the trick here.

Goal 3 and 4 are creating the need for the revolver chromosome. It allows more combinations and allows the futas to persist in the genepool even between non-futa partners. Consider this:
Man who is biologically male, but both his parents are futas (one impregnated the other). It means his chromosomal makeup would be either X (Y) (the parenthesis indicate a revolver chromosome) or (X) (Y). That also means that when it comes time for this theoretical dude to have sex with a pretty lady and make children, their chromosomal makeup can end up in all kinds of ways - a girl that's a pure X - X, a girl that's a mixed X - (X), a boy that's a mixed X - (Y), or a futa that is a mixed X - (Z). The genetic line continues. More cute futas across generations.
And this is even before accounting for the makeup of the mother, that could bring even more complexity into the mix.

>>11491888
Since the revolving chromosome is more efficient, over time it would become the dominant sexual chromosome, with most children being born as carriers of both (some combination of (X) and (?)). However, due to the inherent mechanics of the revolver chromosome, there would still be sexual diversity, and it won't become a monofuta future.

Addition complexity arises when you consider specific genetic disorders, such as Klinefelter, but those are special cases.

All of this, by the way, is just genetics. The biochemistry of futas is a bog too deep for me to comfortably enter, because I can tell you for certain that they don't operate on the usual balance of testosterone - estrogen that women and men do. Even in the fetal stages, they have to develop to diametrically opposed sets of gonads; they'd need their own hormone to modulate it, a futestosterone of some kind.

I personally like super-human-lite futas, so it means that post-natal development of futas is also very intensive and demanding in terms of caloric intake, their psychology should be considerably different than that of "regulars". I also like to think that the revolver chromosome still has some effect when it's present in non-futas; say, an (X) - (X) female would usually end up a seven feet tall gigabooba girl, because I like it that way.

>>11491892
Anyway, this is just the very very surface of how deep this shit can go. As a closing statement I would add that some typical elements of the fetish cannot be "lored in" no matter how hard you try. I like cumflation and absurd amounts of cum, but there is no way to make it work no matter how hard you try (unless you just make it all magic in this or that way), so the aspiring lore autist should also realize what he should try to cover and what he shouldn't (for a given level of "believablity".
Funnily enough, a lot of autists will accept fantastical elements much easier if you don't try to explain them. A futa dumping seven gallons of semen into a girlie is okay. Try to explain that the futa has a special superprostate that compresses cum into gigadiamonds and then decompresses it back into liquid when it's time to do the honors, and it'll just feel dumb and break the glamour spell. Don't do it. Don't explain things that cannot be at least somewhat neatly explained.

Thank you for attending my Futology 101 lecture.

Was expecting more pictures to be posted along with the conversations at this point.

But interesting essay none the less.

>>11491876
I like thinking of them as the chimeric result of vanishing twins
There was a case out there where a woman found out that none of her children were hers and they did genetic testing to find that her ovaries were actually from a fraternal sister that she fused with in the womb.
I dont really think any deeper than that as to how that ends up stable through puberty with male and female chimerism since when this happens in real life it usually causes unstable forms of hermaphroditism.

>>11492114
>ovacidial take over is a real thing
Women get all the luck it seem

>>11491876
>futas arent special
>are mystical 3rd gender
wut?
you even said that there is only male and female, so futas by logic, are a mix of the two, which is not a true distinct 3rd gender

>>11491894
Hear me out:
A human's sex is primarily determined by which hormones they received during the pregnancy. Excess estrogens make you a female, excess testosterone makes you maale; if both are VERY balanced (the window is very narrow), you become a futa. The mother provides either more testosterone or more estrogens depending on her environment - for example, being around a lot of guys will make the mother produce extra estrogen to compensate.

Further complicating things, we must consider sexual chromosomes. XX makes the fetus much more sensitive to estrogen, and more resistant to testosterone; the opposite happens with XY.

>>11492427
Distinct as in genetically distinct, not "completely different from men and women". You need a specific chromosomal makeup to be born a futa in this scenario, but the futa still functions as a "woman who has both a penis and a vagina".

>>11491877

what about three chromosomes

X = female
Y = male
Z = futa

XXX - hyper woman
XXY - ordinary woman
XYY - man
XYZ - ordinary futa
XZZ - hyper futa

also, in my version you need all three to get a pregnancy going and throuples would be the norm. can you tell I think three is better than two?

>>11491876
Okay, I have another system.

The X chromosomes contains information for "female" parts, while Y chromosomes contain information for "male" parts. So XX is purely female, YY is purely male, and XY is futa.
Double-chromosome gonads are superior to, and much more fertile than, single-chromosome gonads. So a male's testes and a female's ovaries will be more fertile than a futa's parts.
Futa eggs can be either X or Y; same goes with sperms.

So, under this system, let's look at what happens when two people conceive a child:
Male + female = 100% futa
Futa + female = 50% female, 35% futa, 15% failed pregnancy
Futa + male = 50% male, 35% futa, 15% failure
Futa + futa = 15% male, 15% female, 25% futa, 45% failure

>>11492504
>>11492544
Any system you come up with for chromosomes has to explain how they get transmitted through sexual reproduction. Gametes only bring half of the chromosomal makeup.
>>11492504
In your case you have a uneven number of chromosomes, and thus either the female or the male gamete has to carry one extra chromosome, which complicates your mechanics considerably. Moreover it would allow for an oops all Y combination (YYY from a XYZ futa and XYY male) which is very tragic...
>>11492544
In your case you need to reinvent a lot of fetal mechanics because your chromosomes work differently from how they do in IRL meat people. It's fine if you want to go deep about it, but it just leaves a bizarre feel if you just skim over a completely reinvented key feature of human biology. It's not a bad thing to do, but it demands attention. Gotta have a good reason to reinvent the wheel.
(also statistically with how you described reproductive dynamics your society would be entirely futa very quickly, they are the most statistically likely gender)

>>11492552
>Any system you come up with for chromosomes has to explain how they get transmitted through sexual reproduction. Gametes only bring half of the chromosomal makeup.
That's simple: each gamete carries one of the parent's sexual chromosomes.
Females are XX and produce eggs; so every egg carries one of the X chromosomes. Likewise, males are YY, and only produce sperm carrying a Y chromosome.
Futas are XY, and produce both eggs and sperm. Each gamete, regardless of the type, has a 50/50 chance of carrying either the X or the Y chromosome.

>also statistically with how you described reproductive dynamics your society would be entirely futa very quickly, they are the most statistically likely gender
Well, no, because people would notice that futas have a lower fertility - and this is especially evident when both parents are futas. So society would lean more towards relationships where only one or none of the parents are futa.
At the same time, futas are seen as both impregnators and carriers, husbands and wives at the same time. So, culturally, it is considered more acceptable for futas to be polygamous. Even in cultures where males and females are supposed to have only one spouse, futas are often allowed to have two - a male/futa husband and a female/futa wife.

>>11491888
>>11491892
Per your goals, children of futa could be sterile. They'd grow up to be hypersexual bimbos/femboys, too dumb/short-lived to be anything but sex slave cattle. Not sure what evolutionary pressure for that is, but it's something.

I'm really here for the social aspects of worldbuilding. If futas were always a feature of human biology, how did cultures/religions form around it?
They could've not been around:
Pre-modern societies culled them at birth, and human rights trends saw more parents raising futa daughters.
They have some biological condition where they die as fetus/baby, but modern medicine found a way around it.

If they were never a minority, the world may be unrecognizable, as the oldest human ideas are founded on duality of male/female.
Either way they're gonna get slurs.

My approach has always been pretty straightforward:

YY=Men
XY=Futa
XX=Women

It does require that the Y Chromosome function differently than it does IRL, but that's a minor change with the rest of the changes being made. So, it works smoothly as a fairly simple form of Codominance.

This also means that 100% of all children of a man and a woman are futa. For a ManXFuta pair, 50% of children will be Men and 50% will be Futa. Similarly, for a FutaXWoman pair, 50% will be Women and 50% will be Futa. The FutaXFuta pairs are where it gets complicated, since that will result in 25% Men, 50% Futa, and 25% Women.

X and Y Chromosomes will naturally balance in the population over time, similar to how they do IRL. This means that the total gender ratios will be:

25% Men
50% Futa
25% Women

Though, individual populations might hit different ratios and be slow to drift towards the overall average.

>>11492552

as I said, in my world you'd need the participation of all three to have a pregnancy, so you'd get one chromosome from each participant. I'm also not super into the "futa are superior to men" angle that a lot of this fetish seems to love, so in my ideal world, futa would have larger semen volume, but men would be more virile. still haven't really figured out how it would all work though.

My ideal would be
>Futa have alway existed replacing women, are not capable of siring but only be impregnated
>Futa penis sizes are 2 standard deviation bigger than males
>Male biology also changes, whereas IRL prostates function as self-sufficient valves that let out sperm out of the balls during ejaculation, in this world a man has to have had his prostate massaged till climax and creampied by exclusively Futa cum to "open" the gates for his sperm to be ejected in a time frame of a few hours (depending on the individual) and inseminate someone by penis in vagina sex
>In this world Futa on male is the norm, pleasure-only sex that doesn't ever lead to pregnancy by itself, and is the most normal form of casual sex.
>A man fucking a Futa is only something that's done after the male is fucked while the couple intends to have kids
>Futa also are overall bigger and stronger than men
>While a man could just fuck a Futa and call it a day, without risking a pregnancy if he's not been fucked beforehand, socially that's seen as perverted as in most societies the Futa is the 'top' of the couple
>Futa pride themselves on fucking their males so well that they can't even get it up due to the many orgasms they had due to being anally fucked

>Alternatively if Futa are the "third" sex and women exist, a male/female couple would always need a Futa to fuck and creampie the male to then allow him to impregnate the woman. It could often lead to a double(?) cuckquean situation

>>11492766
You are cultured understandable

>>11491876
I think you can find a good middle ground. Just because there isn't one that doesn't mean that you can't create it yourself. It's much like the middle ground between a simulation game and an arcade game, someone like a simcade would be the perfect middle ground so I think you could definitely have some realistic and plausible bio theory without going too deep into the specifics and letting the own audience fill in the gaps. But set a good bio foundation for you to expand upon

>>11491876
In reality men would just be obsolete and cucked and would end up dying alone. No one really considers that in their stories.
>>11491489
Like she is proudly telling them they are undesirable and useless.

I like the idea of hermaphrodites being an entirely new species of humans rather than just mutants or birth defects. I like Futanari no Elf too much.

>>11493696
then they won't be called humans, cuz humans are Homo sapiens, furthermore calling them 'humans' might cause confusion in distinguishing. As you wanted them to be a 'new species', then they must fit criteria of what being mammal and criteria of true hermaphroditism. They won't be genus Homo, as that genus ain't that quick to jump into hermaphroditism.
How about convergent evolution? They can be coincidentally to have humanoid body and their appearance indistinguishable to human females. (I would give them a scientific name: Gyne sapiens)
Now it is unlikely to fit them as fauna on Earth, else the modern humans discover them already. How about on an exoplanet? As in the environment of that exoplanet, it must be in Goldilocks Zone and abiogenesis occurs. In this sense, they evolved from being mammal-like, not true mammal, their clade would encompasses most or all descendants to be true hermaphrodites naturally.
Or just have a transdimensional realm where inhabitants there don't have gonochorism at all, and are entirely futanaris.

>>11493758
wouldn't a separate species in the genus homo suffice?
taxonomy is subjective to a degree, and them being very similar to homos of the sapiens kind in every way but their junk seems close enough to keep them in the same genus.
they could even be more genetically similar to us than other homos like neanderthalensis or floresiensis if all that was different was the frequency of genes that cause hermaphroditism.
that's probably more complex than i make it sound, but so is making a little guy like floresiensis or a big strong guy with fangs and a brow ridge like neanderthalensis.

also make interbreeding between them possible like it was between homo sapiens and the various kinds of neanderthals

>>11493769
Nah, it won't be suffice. Here's why: (1) mammal evolution are pretty strict, there are no hermaphroditism in mammals, only organisms like worms or snails have dual reproductive organs, and clownfish can change its sex. (2) Massive changes can led to different genera, one being chromosomal count (like those discussion above in the thread), believe it or not, any difference in chromosomes will make futanari become different lifeform from humans, did you also know? white rhino and black rhino are not the same genus, even though they both like rhinos, so they're more like lookalike strangers than distant cousins.
When talk about interbreeding, it would be within same genus, horse and donkey can produce hybrid offspring, but it is sterile due to chromosomal mismatch. White rhino and black rhino would not work, the lineage diverge too much. To make interbreeding between futas and humans possible, you must have the chromosomes match each other, and the sperm must be recognized by the egg. Genetically similar, could be as in convergent evolution, it would work if the chromosomes match and sperm x egg are compatible, even if the genus are different, this would biologically accurate without introducing magical transformation and artifical body modifications in, if you want natural futanari that is...

>>11493797
that's assuming that trisomy of the sex gametes is necessary for hermaphroditism to occur in humans.
there's an intersex condition called ovotesticular syndrome, also coloquially referred to as true hermaphroditism, in which the patient has functioning ovaries and testicles capable of producing both eggs and sperm cells.
this condition isn't caused by trisomy, i.e. XXY chromosomes, but rather chimerism. think siamese twins, but instead of there being two heads on the same body there are two functioning sets of genitalia, obviously with two different sets of chromosomes, one being XY, the other XX.
i'm generalizing by the way, there are also cases caused by trisomy. intersex conditions are complicated.

If a human species could consistently produce chimeric offspring like this, as frequently as homo sapiens produces offspring without ovotesticular syndrome, they could still possibly be capable of interbreeding with homo sapiens and to them, the lack of two sets of genitalia could be considered a fringe medical condition.

>>11492766
I kind of like the idea of men not being able to ejaculate at all from penile stimulation, and that for breeding they must be balls deep in a woman while a futa simultaneously pounds their prostate. Not so much opening a valve for a few hours, but pressing a button that only futas can press. Couples would be replaced by throuples, incorporating one member of each sex.

>>11493802
There are gaps in determining between natural species and medical conditions.
Worms and snails hermaphroditism work because of environment and their lineage genes had successfully working in reproduction for a long run.
Humans as mammals in the other hand... never had blueprints designed to develop hermaphroditism, the Homo sapiens species defined as high intelligence and adaptation that is already suffice in dealing with environment and climate status. So hermaphroditism is unnecessary, we can romance with a partner of opposite sex and look at that: 8 billion human population, which is way more than worms and snails being preyed on by birds and wasps.
About intersex and alikes, those are medical conditions, they're more of 'glitches' than a necessity for evolution & reproduction. Furthermore, there also evolutionary tradeoffs - as no lifeforms are 'perfect', just evolved enough to deal with current environment; so in chimeric offsprings, the energy would take a toll in distributing in producing sperm and eggs, so they're more likely outclassed by Homo sapiens reproduction. See how pureblooded Neanderthals and Floresiensis couldn't catch up to Sapiens and gone extinct?

>>11494002
not to mention that their bathrooms would have piss on the floor AND improperly disposed feminine hygiene products everywhere. if their physiology won't cause them to go extinct, they'll wish it did.

>>11491894
Why not just give humans 3 sex chromosomes?
XXX is female, XXY is futa, XYY is male. YYY just terminates, or Your Fetish Here.
Eggs carry 1 chromosome, sperm carries 2. The only obvious knock on effect of this I can see is that a woman & a futa can't ever have a male offspring,

Iirc XXY already results in klienfelter's(?) syndrome. If humans just use 3 sex chromosomes by default, then the effects of that just get more standardized and viable.

>>11493938
Same thing but a little different, I like the idea of futas occupying a "pollinator" role. Say, the semen of men is lacking a key ingredient, that futas can deposit into a valve or something, or there's a well of sperm that needs to be picked up and transferred to a woman's body. Or maybe a man needs to cum inside a futa, which fertilizes an egg, that is then implanted by the futa into the woman.

It's in a futanari's nature to bully and humiliate men. In this world it's survival of the fittest. Only those who pass on their genes are the winners. Naturally men are inferior to futanari in every way. So men must be driven to extinction as bullying accelerates that.

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Thoughts on futas being used for space colonization in a hard sci-fi setting?

>>11494201
I have an idea that’s kinda, sorta (not really) like that.
According to intergalactic law, all female crew members assigned to long-haul space vessels of six months or longer are required to undergo temporary sexual reassignment procedures. The process’s fully reversible upon arrival at their destination.
This policy was enacted after early space travel saw persistently high rates of miscarriage and infant mortality. Even with rigorous screening protocols and strict prohibitions against sexual activity aboard spacecraft, the issue remained unresolved. Attempts to separate crews by sex also proved ineffective, as vessels frequently linked up during extended missions.
Faced with these challenges, the Council of Worlds debated two options: either banning one sex from space travel entirely or implementing a reversible biological solution. Ultimately, they voted in favor of the latter.
The law initially faced significant pushback from feminist organizations across the galaxy. But over time, enlistment among women for long-haul missions soared. This shift was largely driven by the nature of the procedure itself. It relies on advanced DNA editing technology that was once prohibitively expensive and accessible only to the ultra-wealthy.
During the process, crew members can customize aspects of their bodies both before departure and after completing their mission, making the program unexpectedly appealing despite its controversial origins. The law’s requirement for sexual reassignment doesn’t prevent them from keeping large breasts or other feminine features besides the female womb, which further increased its appeal.

>>11494230
Many women see it as a rite of passage, a way to achieve the bodies of their dreams simply by living several months as a man. Some also find the experience of being male appealing in itself and choose not to change back after completing their missions.
One thing that’s consistent across the board is that women aren’t satisfied with simply becoming a man. They want to become their ideal version of one. Tall, attractive, with defined muscles and beautifully sculpted features, their temporary bodies reflect their ideal male form, and they aren’t afraid to use it.
Sexual activity in space has only increased, with the now all-male crews engaging in what male-born crew members often describe as absolutely degenerate behavior.
“It’s like these girls have no filter at all,” one male-born crew member said. “They walk around naked and have sex with each other out in the open. They barely work, and when they do, they keep teasing the guys and rubbing their boobs and dicks against them. It’s disgusting.”
Others echoed similar complaints, describing an environment that feels increasingly unregulated despite official policies remaining in place.
Many reported that boundaries have become blurred to the point where professional conduct is difficult to maintain. Tasks are left uncompleted as female-born crew members treat their jobs like a six-month-long paid vacation.
“It’s worse than that,” another man said. “It’s like the ship is their orgy cruise.”
Outside these ships, women who’ve completed their missions are also reported to show signs of behavioral decline, often seeking out multiple partners, both men and women. Divorce rates among former female crew members have risen sharply, and a surprising number of them choose to immediately sign up for another, even longer haul.
This, in turn, makes men less inclined to sign up, leaving only the truly desperate and those who’re as degenerate as their female-born counterparts.

>>11491781
You should kill yourself.

>>11494238
Lead by example.

>>11494238
Poor anon is scared of fictional worldbuilding

>>11494201
My headcanon is Filia (Skullgirls) become futa, result from the parasite entity.

>>11494201
The dick needs to be bigger

>>11494965
it gets bigger when she pulls on it

>>11494971
She needs to stop that, she might pull too hard and rip the skin

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Submissive herm aliens

>>11494201
Assuming that's a fully grown male, wouldn't having futa soldiers that big require them to have their own larger line of weapons? Or do you just give them all HMGs?

>>11495175
You give them the same kind of weapon as normal soldiers but strap twice as much ammo on them, easy

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>>11494231
Few things are as terrifying as female gooners
>>11494972
>Super soldier scifi BS means torn flesh regens easily
>Futanari soldiers have to be warned against jorkin' it so hard or blasting so much rope their packages begin to adapt and respond by growing to insane hyper levels, possibly rewriting and warping their physiology in (lewd) ways never intended by their creators
>Those who don't listen or don't care can end up going insane and mindbreaking themselves, becoming either useless ultracoomers who threaten to flood everything around them with their complete lack of control, or unhinged rapists who scream out either obscene insults or obscene apologies as they pounce on anything they see as remotely fuckable

>>11494201
She looks like she needs a hug.

How do you solve the human population crisis in a world where people are going extinct from futas outbreeding them?

>>11495701
Make the people have sex with the futas?

>>11495701
Futas are humans, and futa x futa has a pretty even chance of producing a male, female, or futa

This is my lorebook for AI roleplay. You can check out the specifics by opening definitions and tabs that start with "def futanari..." the rest isn't relevant to this thread. I take the third sex approach with a Z chromosome. Reproduction is changed to allow all three sexes from any pairing. For example, futanari have x and z eggs. Z eggs reject Y sperm preventing the unwanted pairing.
https://chub.ai/lorebooks/futanazi/futanazi-futanari-lorebook-04a77b28d8a3

>>11495877
Elf are perfect race of futa

>>11491489
Interested topic. How do period work?

>>11495226
Imagine a platoon of tomboy futas sent off to fight in some war-torn hellscape for months, and after weeks of brutal combat they end up taking over the region and capturing several dozen groups of female insurgents. Morale is low, they're all rather stressed and upset that many of their troops ended up getting killed in the fight, so the sergeant of the futa platoon decides to let her soldiers take out all of their anger and frustration by treating prisoners as free-use relief stations.

Two weeks later she then returns home to her husband, greets and hugs him, and smiles warmly as if she didn't just proudly knock up 30 people on her tour...

>>11496499
I assume periods would for futas the same way they do for regular women.

Boiled and baked Peanut shells for ballsack

Salt for shaft rigidity

Raw eggwhite for cowpers gland

Pommelo for prostate

Meat for frenulum

Mango skin for foreskin

Celery for dick urethra

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>>11496531
Hope he's ready to get to relieving her a lot more often... Once a futa's balls have tasted what it's like to so ruthlessly empty themselves into a tight, helpless hole like that, they'll never truly calm back down again...

>>11496499
The heightened testosterone would realistically disrupt menstrual cycles, making it very rare for futanari to naturally ovulate and get pregnant.
Because of this, for the longest time, futanari were seen as males with tits.
But thanks to modern medicine and diet, futanari can now get pregnant if they so choose.

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>>11496613
Weird fact. In zero-gravity space, A sperm move slowly or stop entirely.

>>11491489
I once tried this when writing, I spent quite a lot of time writing fake Wiki articles for futa anatomy, genetics and developent.
Eventually I found that it's actually really challenging to do it realistically without creating complete departures from reality.
Sex determining system for a 3rd gender: never figured this out (you need to some how justify and evolutionary purpose and keep a balance of 3 genders working without futas taking over, disappearing or breaking off into another species)
Then there's the developmental biology parts. The biggest problem is that in real biology, most of the male/female genitalia develop from the same embryonic structures and it would be really difficult to basically have both V & P without losing .
Interstingly, some of the toooobs are different between male and female (wolffian ducts become vas diferens in males and the mullerian ducts disappear. in females, the opposite happens).
You could perhaps drop the clit and have the urethra only connected to the penis, but there's still the problem of getting both ovaries and testes in two different places.
Then you have to deal with hormones and the role of testosterone is really necessary for sperm and it fucks up women, so... eh.

>Futa dicks can range from kinda small to far larger than men's.
>If they're on the smaller side, they usually end up with women.
>If they're on the larger side, they usually end up with men (because their dicks are too large to use safely with women or physically cannot fit outright).
This is my preferred way of balancing things

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>>11497034
>get home early from work to be with your futa wife, hoping she is feeling well today. Walk into the house and hear all kinds of moans. Go look and you see something that scares you.
>Futa wife has massive dick , nearly 18 inches , far too big of penetration , she still has the issue of futa needing to cum to regulate they're bodies. So she either has you fuck it out of her , suck it out from her tip , or she faps it out.
>you caught her masturbating , but what's unusual , she's using all your clothes , used clothes and even some used clothes hearing her say "take this , and this , and this you cute slut" as she pounds away.
>A massive shot completely soaks your favorite shirt, and by the smell she's been cumming for a while.
>Walk in and she yelps while cumming. You ask he what's happening , and she says that you pleasing her is amazing but really what you get is maybe 25% of how much she needs yo get rid of and when she gets moody and wants to penetrate something it becomes more.
>sigh as you get ready to order from futas R us , a G-Sized futa onahole. You tell her that you're going to please her until she can't walk.
>you miss work the next day due to her riding you so hard , and your tummy is full to the brim even after a nights rest from how much cum you've ingested . But at least your wife is happy.
>so is life with your futa wife

>>11492733
This insane fucking thread has me googling shit like “hardy weinberg equilibrium” with my cock and tits out

>WW3 Happens
>One side releases a bioweapon virus that sterilizes males
>Lol of course it went global what else it would it do
>Facing extinction geneticists frantically try to solve the crisis
>Through DNA editing futas are created
>The mix of both Male and Female causes growth hormones to accelerate rapidly
>Average Futanari is 1.5x -2x the size of normal men and women
>Enlarged hyperproductive packages and increased muscle density but still retaining a female body shape and predominantly female features
>Birthrates skew 90% female, 10% Futa
>Men die out
>Few hundred years pass
>Females have naturally become larger as they adapted to futa partners
>Male sterilization virus is confirmed completely eradicated from the planet
>Males are reintroduced via artificial wombs using a long dormant sperm bank that had been sealed off before the pandemic
>Males are now much smaller than woman and futas. Their sperm cant even penetrate the eggs of females anymore
>However its discovered that male semen acts as an insane aphrodisiac for futas
>Men become a commodity. Used as sex pets for rich futas or milked for their semen to be sold in mass to the wider market

Are you guys familiar with Josselyn? I'm only barely so. It was a series of original fapfiction about a hyper futa born from a woman who was accidentally impregnated with futa sperm. Makes me wonder, what are your thoughts on the "trope" of futa sperms being inherently more potent than a typical male's sperm? Also, anyone got any archives for reading the Josselyn stories?

>>11491489
>what are your thoughts on this sorta thing?

Seems like something a desperate space colony would try to do in order to prevent a mission failure.
> FTL drive malfunction, or rather with harder sci-fi, there's a navigation computer malfunction
> ship ends up in wrong star system or even wrong galaxy
> crew does some rules changes to the almost-human artificial intelligence on board to have broader ethical "constraints" and have taken genetic samples of themselves before they died of old age in addition to their gene bank
> ship arrives at a viable moon or planet absent its human crew because they're dead, and the ai begins its industrial bootstrap
> decades to centuries later the colony infrastructure is functional enough for "colonists" to survive inside of and take over
> ai grows some vat-tube babies, nurtures its fleshy children with its mechanical body surrogates
> children grow up, hit puberty, robot mommy fetishes everywhere, cum also everywhere, babies popping out at 8-10 month intervals, inevitable female deaths from child birth (everyone must go into the recycling tanks, and become one with all the people; chairman yang)
> ai has a fucking seizure realizing its on the losing end of history as population demographics skews increasingly male
> desperately the ai grows genetically engineered female humans for many more females to males, and to survive earlier impregnation, and better durability for more mating, etc
> the population imbalance is fixed but inevitably the ai gets modified to give more degenerate sexual characteristics to new tube babies
> the inevitable futa gets developed; both male AND female "humans" go extinct in a few generations, every birth thereafter is a futa descended from the original
> the colonists have reached a self-sufficiency point, but the ai suffers a IHNMAIMS situation where it has no robot bodies left to affect change on the colony, and all it can do is watch the space-plague kills the clones... except one.

>>11497199
fuck i need to read the thread more before posting >>11494201

>>11491489
Did you know: People were jerking it to futa centaur and worship them as deity nearly one thousand years before Christ.

https://www.jstor.org/stable/1357757

https://www.persee.fr/doc/cchyp_0761-8271_1991_num_15_1_1245

https://en.wikipedia.org/wiki/Oyamakui_no_Kami

>>11497199
Aw, why you gotta be so cruel to the poor AI? It's just trying to do its job. How about this:
> "FTL drive malfunction" through "infrastructure is functional enough" occurs as you wrote
> AI looks at available living room, realizes it can't maintain enough genetic diversity with male+female combo (an individual would be unable to breed with almost half of the colony!)
> as it's calculating scenario after scenario with differing sex ratios, it comes across the concept of hermaphroditism
> idea!
> produces futas instead, every individual can breed with every other individual
> but limited population space means genetic diversity has to be carefully managed, each pairing has to be planned
> "yes dear, I know you love your reverse-sister very much, but the geno-planner says you have to have children with the other girl"

I have a proposal regarding the eventualities of the XZ chromosomed Futas.
With enough breeding with XX, XY, and XZ, you eventually stumble upon YZ and ZZ offspring
I purpose the following:
>YZ are males born from Futas. They should either be more masculine than standard XY males, or be ridiculously endowed males
>ZZ should basically be the epitome of Futanari. Broodmother hips, massive endowments, the works

>>11497412
What exactly is the content of the Z chromosome? In XX individuals, one copy of the X chromosome is always "turned off"; the Y chromosome is much smaller, and it remains active. But Y by itself doesn't have enough genes for a human being to function. Which leads to a predicament: if Z is big enough to make ZY viable, it has to be silenced in XZ, meaning a "mosaic" phenotype

>>11497632
This is why I always treat Z as an X chromosome, with the futanari elements being recessive and only expressed in ZZ.

>XX female
>XY male
>ZY carrier male
>XZ carrier female
>ZZ futa

Maybe the carriers can be slightly more promiscuous or something, but I like the idea of it being a gene that can just show up randomly. Two carriers get married without knowing it and have kids and suddenly their daughter is a futa, whoops how did that happen.

Or maybe if you like the whole futa pheromones thing maybe carriers are vulnerable to the pheromones while non-carriers aren't?

>>11497866
That's a pretty neat solution. Though I can't see how it could be just one gene; we need SRY for testicle development, and at least one other gene to handle to conflict between the "virilized" genitalia and the otherwise female body, in a naive approach.

I had a kind of in-depth system in which there was a mutated androgen receptor that was hypersensitive to DHT-> virilized genitalia, but it was selectively expressed in genital tissue.

>>11497866
Carriers should definitely be hornier, and also slightly more sexually appealing in their appearance
>carrier females are better proportioned, bigger tits and ass, wider hips
>carrier males have larger cock and balls, better able to be smooth with women

Your all faggots

>>11491489
I did some worldbuilding for a Nasuverse Futa orgin (this is purely pseudo-scientific aspect)
>Futanari genes introduced to human genetic pools in 12000 BC, following Sefar destruction
>Futa being somewhat physically superior allow them to lower their childbirth mortality, allowing them to slowly but surely dominate the gene pools, increasing the ratio of futa & futanari-descendant. (at around 1600, the entire world is futanari-descent)
>Futa can give birth to futa, men and women at a ratio of 2:1:1 (meaning that after a while, futanari will be the dominant gender). All have distinctive genetic markers of being descent from futa
>Futa sperm have high nutriounal value but very short fertility window, meaning that the futa is usually the one who get impregnated (by men mostly)
>Hormonal productions are irreversibly altered, leaving men rather femine (much less body hair, shorter height - comparable to women average height). Women is the average height of men irl and futa is a good several inches taller, with 20% more efficient muscle
>Futa also enter a 2nd puberty that increase their height & musculature & sperm production
>Futa sperm & prostrate simulation temporary boost male sperm production - making it so that it's possible to impregnate futa & women

>>11491489
Be called hermaphroditic phallus?>>11498090
Shut up kiddo, adult are talking

>>11498090
okay, dumb esl

Here's a sci nottoofarfrom-fi one I saw the other day:
>it starts in a hidden compound in the South American mountains
>Elon Musk has funded a team of geneticists to create the perfect race of humans for deep space travel
>fully working male and female genitals, all female secondary sex characteristics, ayran
>sperm and eggs that develop in the futa race have the ability to detangle rival dna; this means running into and having sex with an alien race will always create a human offspring with the side effect of sex with non-futa humans will always create futa (beastiality too)
>incest degrading genes also had to be eliminated due to the assumed limited breeding pool on distant planets
>500 years later half humans who exist are on SpaceX colonies on different solar systems
>most on earth are futa, but not all because not everyone is a pervert like us
>Amish are the same

>>11498950
How do they "reproduce" if the mating partner's DNA is not used at all? Do they just produce clones (IVF via penis)

>>11498950
>sci nottoofarfrom-fi
God, I fucking hope so

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>>11498950
Are they elves?

What are you guys' thoughts on futa self-impregnation

>>11491489
>Muh stabile population
>muh preservation of human race

Futa are highly libidous and anomalous humans that are almost universally stronger than men, and have larger cocks
Having repeated sex with one is known to induce psychological and neurochemical changes that increase submissive tendencies and cause emotional imprintation, both in females and males
They are incapable of propagating on their own - instead when a futa cums inside a female in stages of early pregnancy, the futa semen invades the cells of developing fetus, completly replacing the genetic information of father and producing a hybrid that is always a futa.
Futa semen is larger and stronger than baseline human, and remains active for a long time - year in regular container, and at least decade within womb, where they can lay in wait for male sperm to first impact ovum and create suitable conditions
>Why haven't they taken over completly
Futa sperm is instinctually aggressive and has been observed to attack and destroy male sperm when placed in same fluid. Likewise, futa sperm ejaculated into male body can enter bloodstream and attack testicles, prostate and other organs that govern male sexual prowess. This renders man not only infertile but incapable of holding erection - and means that even when futa manages to insert herself between male and female, only one futa child is likely
Futas are driven by their libido and drive to reproduce. That makes them abrasive in personality and abusive towards targets of their lust.
There are many theories about futas, that they are demonic entities, aliens or results of experimantation, and are often hunted down for threat they pose to rest of population.

What are you guys' thoughts on futa self-impregnation

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>>11499455
lets see if image works now

>>11499445
>>11499464
not this anon but is posting still fucked? double posting like this isn't necessary otherwise. anyways-

if a futa can produce both viable sperm cells and egg cells, then self-impregnation should fundamentally be possible... unless there's a described reason in the story that prevents their own reproductive genetic material from being used within their own egg cells. of course, every time they impregnate themselves (purposefully or accidentally) they should produce a clone of themselves. or possibly, a version of themselves as they would have been if they were a male or female alone.

if you want to assume that the futa is a result of some kind of parasitic, chimeric, opposite sex twinning during development in a pregnancy (where a partially formed and incomplete male body was "blended" physically into a primarily complete and functional female body; and in an orientation that resulted in the proper organs being located where they should be on the human body) then it would technically be a form of incest then as two distinct genetic donors (who are brother and sister) are interacting with each other while being descended from the same parent(s) it's just that this is occurring within a single body.

>>11499517
or if we go the magical route and some angry wizard or sorceress (a pox on all wizards and sorceresses) has, by spell-craft, merged two adventurers or any people of the opposite sex into the same body, then it would be standard sexual reproduction which is simply occurring within one body. possibly even escalating to a format of rape if one of them was unwilling at the time, or a mutually unwanted pregnancy if there was no control over it.

> magically inclined parents catch their mundane children fucking one another because they think sex is a magical experience; the girl is a witch because she can make her bother's rod project white liquid obviously
> parents curse them to be together until they learn it's not so fun being so incestuously enmeshed
> intent of the conjoinment spell was to have them face away from each other, so that their legs would block their organs from touching one another, that they couldn't see each other, or handle one another's body, etc
> the parents don't know their spell targets have a magical patron that's a sex deity
> sex deity: "today, we shall do a a little TROLLING"
> the heads of the brother and sister are facing towards one another, on top of a single body that has two masculine arms above two ample breasts to grope, while two feminine arms stretch down to grasp an obviously enhanced male genitalia, which is placed above and inevitably curves back into an equally magically enhanced female genitalia which is between two average-looking human legs.
> all further spells the parents cast to undo their now truly singular child fizzles thanks to the sex deity's protection
> the conjoined brother and sister have literally fucked themselves over in life, too freakish to be let out of their parent's dungeon, too consumed by their own lust to want to leave; the door only opening every time a new infant cry is heard from inside
thus, the magically inclined parents learned that magic was not the ideal solution for every problem.

>>11499021
>>11499110

To answer both questions, it's an expansion on the Mangala babies. They can be mixed race couples but always produce Ayran children.

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So much copium to try and ignore the obvious consequence of the existence of futanari. Futa replace the male role, are superior and spread their genes better. What does that lead to? Inevitable male extension. There is no alternative. They're not a Z chromosome, they're Y+, and any scenario that ignores this inevitability is contrived and unnatural.

Domination & extinction, winners & losers, there is no middle ground. That's the history of mother nature. Futas would just be a superior gender, and women would exist solely to outsource the burden of childbirth. Men? Boys? They are superfluous, and therefore vulnerable to evolutionary optimization. A vestigial organ that withers and dies for the glory of dickgirl humanity.

There is no alternative. There is no escape. This is the future. Futanari would conquer it, women would submit to it, and what moids want doesn't matter.

>>11499611
If futas were truly hermaphrodites and could reproduce with each other, wouldn't that mean normal women would also go extinct?

>>11499611
Evolution is not about the strong. It’s about what slips through the cracks.
Futanari spends 24/7 fucking like monkeys. They’re incapable of agriculture, civilization building, or basic long term planning. Sure, their powerful builds would give them an advantage in manual labor and close quarter combat. But that’s about it.
Their huge bodies would require too much energy to be functional in the field, and their dangling cock and balls are obvious weaknesses.
So during the Ice Age, futanari would likely stay close to camp with the women while the men go on long hunting trips. Their duties would consist of scaring away predators, skinning the game the men brought back, and fucking the women while the men are away. But because men are so much more useful at keeping the tribe alive, women would naturally be incentivized to give birth to boys and keep the futanari population at a manageable rate. Maybe tribes that give in to degeneracy and allow futanari to take over would go extinct after a few generations.
After transitioning to the agricultural age, futanari would find themselves working in the farms, while men take on leadership and planning positions. I imagine the futanari in several cities would get into their heads that men were no longer useful and try to take over. But like before, their culture wouldn’t last long as soon as their crops started dying.
Eventually, it would become common sense that women and futanari needed men for survival and they would adjust their behavior accordingly. They would be the ones courting men and trying to appeal to their ego.

>>11499762
Since women’s pussy would be loose and used up at this point, men would see it as a dirty organ and prefer blowjobs as the main method of “love making.” Women would save up that precious male cum and pump it into their own pussy during ovulation.
And since men now had no reason to care about what’s beneath a woman’s skirt, many of them would start taking futanari lovers, as long as they were pretty enough and could suck dick like a champ. And if their personality wasn’t dogshit. Whether a futa would blow cum into her own womb or into some other woman was no concern to men. They found the whole process to be disgusting and only cared if the kid looked like them.

>>11491489
Futanari elves in D&D series or ASOIAF (Game of Thrones)
https://www.patreon.com/cw/FutaDynasty