U dont have to be gay to play this game
That is true . . . of any game.
As far as I'm aware though the content of this game is oriented towards displaying M/M Sexual content and aside from the main antagonist I'm not really aware of (I don't think its really explicitly said what most of the character genders are) any other female characters in the game that Max is probably going to interact with sexually.
Breasts aren't strictly female
Penises aren't strictly male.
But the content of the game is fairly homo-erotic, I'm convinced, to the extent that I think being open to a sexual identity you weren't aware of before is probably not a bad take for someone to recommend.