The scene in the elevator with Cyndi is ... well, it's sort of what this game has instead of a tutorial. Cyndi doesn't play fair, but then, a lot of scenarios throughout the game don't exactly play fair (bearing in mind that mind control is one of the major recurring themes) Your sex in the elevator scene doesn't affect its outcome at all. Sometime your physical sex is important in this game, sometimes not.
However, if you consider sexual orientation to be rigid--well, I won't go into whether I agree or not, but I think that there would definitely be content later that you'd find objectionable, as the game definitely does try to force the players to, ah, bat for both teams from time to time.
Sorry you didn't like it.