>>12856940Frizzy hair on the head kept our brain cool in Africa, in colder climates it became straight to drape around our necks for warmth. Pubic and armpit hair prevents chafing and serves to visually identify sexual maturity, so that we don't waste valuable time raping prepubescent individuals. I haven't heard a satisfactory explanation for facial hair so it exists because women found it attractive, or associated it with virility.