It’s because in the nineties there were several mainstream movies that glamorized lesbianism. The premise is that heteroseuxual men find lesbians attractive, which according to mainstream heterosexual porn is true. So for the most part, in my opinion, it is heterosexual girls using the illusion of lesbianism to attract guys. That said, it is also much more acceptable now than it used to be for one to experiment with homosexuality – even more so for women, because guys will still be attracted to you if you have fooled around with women. However, there’s still more of a risk of becoming stigmatized as a heterosexual man who has experimented with homosexuality, especially because it is through so-called gay sex that AIDS is transmitted.