taos, no, it's not only based on sex. But since the gay community is outside of regular society, there's a ton of baggage and gender roles etc. that gay people don't have to put up with. Instead, we can just openly say "I want to fuck you" or "I'm interested in dating you". No playing each other, no charades, no slut-shaming as we have with forward women, no passivity that we have with insecure women, most of all, open communication instead of trying and failing to read subtle body signals since it's not socially acceptable among straight people to just say "Hey, I want to fuck you". Of course not every gay person is functional, rational and able to communicate, but it's a lot more common.