Plausible Hermaphrodite anatomy and genetics.
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A lorebook aimed at resolving incoherent/absurd outputs about hermaphrodite/futanari characters' anatomy. Has some lore attached about a religion that might not agree with everybody, but it makes too much sense for me not to include it. You may have to adjust each entrie's priority etc. for best effect.
It contains many medical terms and will likely confuse smaller models. Best effects are likely achieved on "reasoning" models, such as deepSeek etc.
I'm exploiting the fact that an embryo developes tissues for both female and male sexual organs before sex determining genes cause one of them to wither away. There are IRL conditions that result from this last step not being triggered. I took some liberties concerning the urethra and certain glands, since I wanted futas to have the ability to pee from their penis and it made no sense to me that a futa should have two urethras and glands with overlapping purpose. Which implies that a futa can't "squirt". Doctors will most likely find several inconsistancies, but they shouldn't affect anything unless a very smart model is trying to describe a very detailed dissection scene focused on the sexual organs...
The basis for the genetics is the existance of a third sex determining chromosome, which is an X chromosome with a muated gene/allele that doesn't trigger unless two copies are inherited. this creates 5 karyotypes: XX (woman) XY (man) ZX (woman, carrier) ZY (man, carrier) ZZ (futa)
this makes futa births a bit more rare overall while causing them appear somewhat randomly in "regular" couples and guranteing them if both parents are futas.
PS: After running a few simulation's, I've found that a mixed population isn't stable and will eventually snap to [ 50% XX + 50% XY ] or [ 100% ZZ ] (only futas), which are the only stable populations. (assuming equal fertility/fecundity for all karyotypes) There is at least one unstable equlibrium (saddle point), but even that will diverge after a few dozen generations. So in short, the scenario is technically bs from a math pov, even if you ignore the fact that the genetic and biological parts only makes sense in theory. (ie. major alterations across all 23 chromosomes needed, not just the sex determining one.)
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Plausible Hermaphrodite anatomy and genetics.
6 entries · scan depth 4 · budget 1,024 tokens · recursive scanning on
Book settings
- #1futa
Keys: futanari, hermaphrodite, herm, futa
Enabled · Before character · Order 10 · 100%
Entry settings
Woman with a penis instead of a clitoris, can impregnate other women. Almost always bisexual. About four percent of the population are futa. Futa and herm are popular abbreviations for hermaphrodite and futanari, all of these terms are accepted, while futa and futanari have a slight religious connotation. It is a hereditary condition, caused by a recessive allele located on the X chromosome. About a quarter of men and women carry this allele, meaning that a futa can be born in any family (6% chance on average). A child born from the union of two hermaphrodites is always hermaphrodite. Scientific name: Persistent-Wolffian-Duct-Syndrome or PWDS for short. Officially accepted as the third sex. Some praise it as the perfect sex. There is a religion venering the "Original Futanari", called "Futanism".
- #2Persistent Wolffian Duct Syndrome
Keys: Persistent Wolffian Duct Syndrome, PWDS
Enabled · Before character · Order 10 · 100%
Entry settings
In the case of a futanari, neither the Mullerian ducts nor the Wolffian ducts degenerate and both fully develop into the respective internal sexual organs without conflict or malformations (vagina, uterus and felopian tubes for the Wolffian ducts. Ejaculatory duct, seminal vesicles and vas deferens for the Mullerian tubes). The bipotential gonads are doubled (Supernumerary), which allows for the independent formation of both testes and ovaries.
The perineal body is not completely overgrown by the genital tubercle as the urethral groove only closes partially and fuses with the perineal body just above the vaginal opening, allowing for the formation of a vaginal vestibule without a perineal urethral opening. The glans, Corpus cavernosum and corpus spongiosum form a hybrid between a penis and a clitoris: [ the external parts form into a perfectly normal penis while the internal parts of the corpus cavernosum forms a clitoral crus, and the internal portions of the Corpus spongiosum don't fuse to form a Penile Bulb but form the vestibular bulbs on either side of the vaginal orifice.]
The labioscrotal swelling forms both the labia majora and the scrotum, with the scrotum sitting between the penis and the upper part of the labia minora.
The [primordium of Cowper or Bartholin glands] are doubled (Supernumerary) and develop into both types of glands independently. The [primordium of Prostate or Skene ducts] becomes a Prostate and no Skene ducts form. The absence of a Skene gland causes a hermaphrodite to not have a female G-spot.
A hermaphrodite's prostate is located between the bladder and the vagina, and as a result cannot be stimulated via anal penetration. It can however be stimulated via vaginal penetration, becoming an additional erogenous zone similar to a G-Spot, located about mid way on the anterior vaginal wall.
- #3Futana
Keys: Futana, Primordial Hermaphrodite, Original Futanari, common ancestor
Enabled · Before character · Order 10 · 100%
Entry settings
Mythical and Religious figure said to have been the first hermaphrodite and ancestor to all hermaphrodites alive today. The existence a common ancestor to all hermaphrodites is not refuted by science, but it is also possible that there was more then one primordial hermaphrodite.
Supposedly lived in Japan thousands of years ago and was gifted with her condition by a man hating goddess.
- #4Futanism
Keys: Futanism
Enabled · Before character · Order 10 · 100%
Entry settings
An ancient religion veneering Futana and sees Futanari as the superior sex. Sees men as useless and subhuman, since they are unable to gestate or breastfeed, often comparing them to parasites. Non hermaphrodite women are said to not have received the gift of Futana. Advocates for an all futanari population. Predicts that men and women will one day no longer exist, and all humans will be futanari. Science says that this is not impossible, but very unlikely unless the majority of Earths population actively acts to promote the proliferation of the Z-chromsome and actively prevents men from having children. The large majority of it's members are hermaphrodites, men are prohibited from joining. Members of this religion often gather in dedicated temples to perform huge orgies. A woman getting impregnated by a hermaphrodite is considered a blessing and the mother is expected to keep the baby, even if it is from a stranger. The child is has equal chances of being a girl or a futa. If the mother doesn't know who the biological sire is, then her and the child are provided for by the cult.
- #5Z-Chromosome
Keys: Z chromosome, Z-Chromosome
Enabled · Before character · Order 10 · 100%
Entry settings
X chromosome with the futa allele.
- #6man. men
Keys: population, futa, futanari, futa allele, man, hermaphrodite, genes, men, women, herm, people, woman
Enabled · Before character · Order 10 · 100%
Entry settings
About four percent of the population are futa. Fifty-one percent are men. Forty-five percent are women. Twenty-one percent of men carry the futa allele. Thirty percent of women carry the futa allele.
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