Question: why do we only have lots of hair in certain areas?

Joanna Cruden answered on 15 Jun 2012:

I think maybe is just how we have evolved, we started by being very hairy then discovered how to keep warm by wearing clothing and fire so we did not need as much hair to protect us from the elements and regulate our body temperature.

However there are several thoughts around why we do for example some scientists think Pubic and underarm hair absorb sweat and odour, they get thick because we remove the hair and the body reacts by growing more. Whereas others suspect it helps regulate the temperature. But to be honest nobody seems to know the answer yet