As far as human evolution....?

Question

Why do we have such long hair (I mean naturaly if its not cut)

Answer 1

maybe because of sexual selection

Answer 2

As far as evolution is concerned, we have long hair because there is no selection pressure against it.

Answer 3

Having nice hair is a sign that you are healthy.  So that's why our bodies keep growing it, so we can keep advertising that we are in good health.