Female Digestive & Reproductive System

In this reality, the vagina is extremely flexible. It painlessly stretches very very wide, and after sex, it goes back to a very tight position. It also goes much, much deeper inside a woman's torso. No matter the amount of cocks she receives, or the force of the penetration, the vagina always goes back to its initial tightness. At the end of the vagina, the cervix has evolved into some kind of valve, which, if the woman is in a fertile period, it will allow an amount of strong semen to into the uterus to continue with fertilization, like in our world. If the conditions are not the right ones, the cervix instead will let semen into a different channel that connects to the intestines to digest the fluids.

If fertilization happens, as pregnancy progresses, the uterus moves down towards the vulva, and the vagina shortens dramatically to help with birth. After delivery, the whole system goes back to normal at a surprisingly quick pace.

Given they only need to digest semen, women's intestines have been simplified by evolution, so they occupy little space in their body. A woman's rectum is longer and as flexible as her vagina, and evolution has given her something else: the inner surface of a womanis rectum can taste, so they enjoy both the texture of cocks in higher detail, and they also taste the flavor of the semen that they eat anally. After receiving a big load anally, the intestines pump the cum upwards to the small (and much shorter) intestines, where it's digested.

The bones of a woman's jaw do unhinge slightly. It is painless, and allows women to take huge cocks down their throat without issue. Their stomachs are much flexible, so they can receive gallons of jizz wihout harm. They can also receive such volume anally, and it actually digests faster this way.