So here's the thing. Men will not become passé only because more and more women are lesbians. You'd think that men would eventually become the unnecessary and unwanted part of a society that relies on alternative forms of impregnation, instead of the classic penis in a vagina.
In this moment in time, women still enjoy the occasional penis in their vaginas or anuses but we see that there is a steady shift towards same-sex relationships. However, the same is true for men, as they seem to shift significantly in the direction of offering their own anuses to other men. This is the premise, the current state of things and there is no reason to think it would change in the future.
But here is the catch.
As women entertain themselves in intercourse among themselves, evolution dictates that the pelvic grinding and stimulation performed by generations of lesbians will lead to a slow but evident increase of the clitoris' size, eventually reaching the dimensions of a small erect penis.
At the same time, men, who are already enjoying stuffing their anuses with medium and large penises, will experience the opposite phenomenon. The narrow and unlubricated passage that is the human anus will encourage a tightening and shrinking of the penis, most probably to the size of a lipstick: tightening, for a smoother insertion; shrinking, for easier control.
We're heading into undiscovered territory, in which the human clitoris is now comparable in size of the human penis. You will agree that the most plausible theory is that the penis will temporarily lose its attraction. The male penis will only be accompanied by the anus, whereas the clitoris, of the same size and shape, will come packed with both anus and vagina, for more entertainment. Women will look for women, men will look for both.
But we are forgetting about an amazing feature of the male human body that will tip the scales over to men again and restore the balance. It is the unassuming ballsack. As men get rejected by women for intercourse, they will rely on each other's, now perfectly fitting and compatible, anuses. And much like how evolution engineered a stronger and firmer clitoris, the ballsack will be subjected to a similar fate.
The hanging nature of the ballsack will subject it to repeated blunt trauma against the buttocks of one's lover. This will transform the sack to a coriaceous, leathery shell, harder and harder with the passing generations. The balls will grow bigger and bigger, surpassing the penis in both size and firmness. There will one day be a generation of men who understand this new power that evolution has granted them and will use it to their advantage. One day, a man will insert his stiff ballsack into a woman's vagina. And everything will be different.
Source:
https://old.reddit.com/quzk3a