It's not bouldering that makes your hair fall out, it's just climbing in general, you should try it some day, instead of just talking about it.. Oh, and being able to spell properly.
On the other hand:
"One theory, advanced by Muscarella & Cunnhinham, suggests baldness evolved in males through sexual selection as an enhanced signal of aging and social maturity, whereby aggression and risk-taking decrease and nurturing behaviours increase."
Hmm.. moving towards bouldering is indeed a decrease in risk-taking. Perhaps you're onto something!
I have to say though, my aggression level is pretty high. Careful when you diss the hair (or lack thereof).