If humans evolved long hair as sun protection then why do so many adult men NOT have long hair? Do they not need sun protection?
Read “The Descent of Woman” by Elaine Morgan. Such a drastic mutation as continuously growing head hair in adult females is, by necessity, connected to procreation and child rearing.
Humans have the longest comparative child rearing lifespan of all animals. It requires drastic measures. Mothers and babies are key. Humans evolved in a marine environment during a critical period when land predators ran mothers and their infants into the surf. Mothers with upright gaits and long hair, along with swimming babies with strong hand grips, became requirements of human survival.
Fathers were unimportant.
Another View is that men, being the ‘protectors’, and needing to fight off other men from other tribal groups, long hair was a disadvantage and a problem.
Women then, being the procreators, would choose to mate with the men who were more victorious in the fights, in so doing they would pass along the male pattern baldness gene...........