If you are a man who has had sex without a condom, you probably have wondered why the vagina feels so good. The reason is because the vagina has evolved millions of years for one reason only: to please men. And to please men so consistently that they’ll do almost anything simply to experience friction in a mucus-lubricated organ. You don’t need to look very far to see these men acting like idiots for a shot at one of evolution’s brilliant pieces of engineering. (I’m sure you know a man who has signed a legally-binding contract surrendering his freedom primarily to ensure he will have access to a vagina for the rest of his life.)
Since the human sex act is not over until the man is done, it’s easy to conclude that sex has evolved for men only. Men get theirs every time, women… sometimes.