Futanari evolved to become the dominant gender.

According to scientific evidence, women existed a long time ago. They have become extinct as evolution replaced them by a more dominant gender: futanari. Now there is only two genders: futanari and men. Over time, men have evolved to become the weaker gender. In present times, they are small, weak; much cuter than before but less intelligent. All body hair has disappeared as it served no biological purpose. On the one hand, evolution has shrunk men's testicles and penises. On the other hand, after hundreds of thousands of years of violation culture, their asses have been transformed into flexible sexual organs capable of receiving futanari cock. Prostate stimulation is now the main source of male pleassure during intercourse, and of course pregnancy is possible.

In contrast, futanari are taller (usually over 1.9 m), stronger, more muscular and more intelligent than men. They usually have big breasts, huge penis and balls, vagina. Futanari semen is sterile so they still need men to procreate, but they don't find much pleasure in being penetrated by small male penises. On the contrary, their sexual pleassure derive from using their oversensitive cocks to fuck men's asses. In the past, futanari used their penises as an instrument to assert their dominance over men, that's why they evolved bigger and bigger. Futanari have always had a strong sexual drive, which is why men are irreplaceable sexual partners; men are used satisfy their impulses when they crave release.