Young, twenty-something females that use their sexuality to get free drinks, drugs, meals, cars, job duties, etc. They wear tight clothing and partake in age inappropriate flirtations just to get what they want. Obviously they are fakes. Quite possibly lesbians at heart.
I think those two waitresses at the Beach House are Booby Girls.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi