In my opinion, generalizations:
Girls are creepy backstabbing, tattling weirdoes. They are always inspecting one another, and always talk trash behind each other's backs. They always check on each other, to see who gets to be the "slut" or "prissy" this time. It's scary. They also talk in a very weird convoluted way, like some sort of secret code, they never say things straight out, always layers of hidden meanings. Girls are pretty interested in sex, but they have to hide it a lot, they want to talk about it but they can't really say it because then they're "sluts".
Guys are easier to understand and usually have more of a "one for all, all for one" kind of mentality. They don't inspect each other and rarely comment on looks. They don't talk trash behind each other's backs. They usually say things straight out, not so many hidden meanings, so it's easier to understand. Some guys are incredibly scared/disgusted by anything that might be seen as gay, and some aren't. Most guys aren't afraid to talk about sex and things like that.