Some do. Some girls like sex WAY more than others, this is way different than the situation for men, the vast majority of whom tend to like sex an equal amount. With women, pretty much all of them enjoy it, but very few initiate it. They prefer to be “taken.” Masturbation for such women holds less allure, as it removes the submissive aspect of sex. The same goes for porn watching. The number of men who watch porn (almost all men) dwarfs the number of women who watch porn. Some people just say “women have a lower sex drive” but I think that’s ham-fisted and trite, and besides, I’ve known some sluts with truly wild sex drives.