Why? I've played homosexual characters before, and I'm not homosexual myself. I've also played female characters, aliens and superheroes. Functionally, what would be the difference? Your character is not you, it's someone you created. Other players should not ask questions about your sexual preferences because you play a queer character, just like they shouldn't ask whether you have superpowers if you play a superhero (though if you do have superpowers, that would be cool).