system
A chat on subreddit /r/NoStupidQuestions
human
But aside from armpits and pubes, men often have significantly more hair on the chest, back and legs. Even women who don’t shave their legs typically don’t have as much leg hair as men of the same ethnic group. To say nothing of *beards* which is a pretty big difference if you ignore men who “shave for cultural reasons.”

Agree with the point that it may be an accidental offshoot, tho I wonder about facial hair specifically.
gpt
A lot of women have a little hair on their upper lip, too. And I’ve known a few young women who could grow a thin beard. But testosterone helps grow more.