Hair is one thing I am overly freaked out about, I don't consider myself to be a superficial guy about many things, but when a girl I think is attractive has hints of facial hair or armpit hair (et al.) it really, really turns me off.
It's not just for girls, however. I don't like the idea of hair on my own body either, I once said "I'd like to bathe in Nair" and I think I might still go for that.