Women and Men generally have facial hair and back hair etc. Reason why you don't see it so often is because, which girl in society today wants to have a beard? And sometimes beards don't look good on guys. Women shave a lot of hair off, sometimes men do too. I leave a little bit of facial hair on my face because I think it looks manly.

And by the way I think hair in general (hair everywhere! back, legs....and yes even down there -_^) is meant to keep you warm, and maybe protect you from some weather conditions. It's better than nothing right?