answer:There are obviously a number of factors contributing to men being hairier than women but I believe that it is predominantly caused by higher levels of testosterone (for public hair), dihydrotestosterone (for facial hair), and related hormones in men. These hormones are manufactured primarily by the testes, which explains why human males do not become hairier than their female counterparts until their testes develop during puberty. This biological effect is reinforced by social norms, that dictate women remove hair from their legs, armpits, face, bikini line, etc. The cause-behind-the-cause may be related to sexual dimorphism.