Women seem to be less agressive than men. If a girl gets into a fist fight when she's pregnant, she can lose the baby.
When a man and a woman make a baby, the woman's pregnancy takes nearly a year; the man's half of the job took only a few minutes. You can always know who the mother is (she's the one lying on the table screaming her head off); you can't be as certain who the father is. This is probably why traditional cultures such as Aeabia exercide tight controls over their women.
The man must WANT sex, the woman need not. This is the reason why an evil man can rape an innocent woman but an evil woman can not rape an innocent man.
It may also be the reason that you often see a women selling sex to men, but you rarely encounter a man selling sex to women.
Most cultures demand that a man be clean shaven, or nearly so. It's a pain in the ass to have to shave every morning. Medical science, please make me a pill that prevents my beard!