I really disagree that the only impact those thematic elements would have on those characters is "not making out in public". Identity is a complex and dense issue and even in our relatively more "enlightened time" playing characters with non straight sexualities and gender identities is playing characters shaped by the systemic oppression of their environment.
Like I said ymmv but I do think that if that's the only impact of your thematic universe on your pcs, that would be a different but other reason the game is not for me.