I don't think it is quite as simple as that really. I think some girls think they don't have anything else. I know a girl who has done stuff with over 100 people but no one stops too think why? I think it is generally down too the theory of unsubconciously wanting someone like your dad. Most people who are 'promiscious' if you like, generally have background and a reason too be that way. Not that it is acceptable but people shouldn't be so quick too judge before you know everything about them.