A lot. They usually have no sense of humor. At least not one compatible with mine. And most importantly, they don't put out. See above. There is this one girl in my class who won't date another because he is a Baptist and she is Catholic. I mean what the fuck. But most importantly they don't put out. But that's the ones in my class, not in general so I don't have a problem with all of them. Same for me, dude.