Most Helpful Guy
Some do, some don't (pixie cuts can be damned cute).
I personally prefer long-ish hair, but hair down to the butt really needs to be put up. And while the Lady Godiva look is nice, loose hair in the bedroom can be... problematic.
On the other hand... hair up in braids, pinned in cool ways? Can look really really cool.
So, yes. Guys like hair. Heck, women without hair look pretty cool, too.
A better approach is "what kind of hair do *I* like?" I'll give you a hint here... if a guy likes you, he's going to end up liking your hair. Every length my gf's hair has been hasn't appealed to me... at the start. Later on, I realize how much I like it. So, you know, go with what you want - your style, you can show off to guys how cool it is.