Actually in the novels a caste system was set in, but since they aren't movies most people don't consider them "canon" which I think is a load of bull. Anyway, the AvP novels said most females stay on the home planet and are not hunters, though there are few who are. I don't remember all of the specifics, but it's there.
Also, if anyone is interested in the novels, steer clear of Forever Midnight, while the author did his best to make the Predators more 'alienlike' - he also made them enslaving, mind controlling, ass kissing, hermaphrodites. Any other novel though, gets this Predator nerd's two thumbs up.
-And I believe Anderson loosely based Lex and Scar on the story/relationship of Broken Tusk and Machiko in the comics/novel. She saved him, he saved her, upon his death he blooded her after she had killed a queen... in the movie, it was nearly the same scenario, which a lot of people didn't know. I for one, enjoyed the ending of AvP because it gave a nod to the comics, though totally not staying true to them.