While I'd feel like a pariah here admitting this, I do get extremely turned on by hair cutting, but please understand that I never would encourage any girl to cut their hair for I feel the same pain as you all when they do.
As for your question, it's the first time I ever thought "why?" and after a long hard think I can honestly say I have no idea. Perhaps because it's so "wrong" or "taboo" is my only guess, not a satisfying answer I know.
It's not often I make hair cutting the subject of my attention, but if I do, after I have finished I do feel a strong sense of shame, it goes against everything I love after all.