It doesn?t disturb me, but yes, it would be nice to have some diversity. You could say the same thing about the underrepresentation of minorities, non-sexualized females, and transgender people*, especially as main characters rather than supporting characters. But, because gaming is still a relatively young medium, they?d just end up making most homosexual characters in-your-face stereotypes or have it as their only defining personality trait. And everyone knows that sexuality shouldn?t be a personality trait. I mean, wasn?t there an extremely pandering sex scene in God of War 3 that had a bunch of ?honorary lesbians? getting turned on by Kratos and then turning their arousal on each other? Jesus Christ, we?re not all horny teenage boys, and even if we were, we can find that shit on the internet. We don?t need a video game to get our jollies.
What I do find annoying, in both films and video games, is how they try to shoehorn relationships, obviously mostly heterosexual, into things that don?t call for it. Like in The Matrix, the entirely unnecessary plot point towards the end of Trinity, the only woman on the team, falling in love with Neo for no fucking reason and kissing him to give him life when he?d been knocked unconscious by Agent Smith.
As for whether or not it would turn some gamers off from buying a game?really? I think even the most immature of homophobes wouldn?t be bothered that much from a male main character perhaps muttering on the attractiveness of his male comrade, or maybe a woman?s supposedly unhealthy fixation of the female antagonist that?s eventually discovered to be her anger at their betrayal in a relationship. Or, you know, subtle implications. I?m just snowballing here, but something like that would be fine. Good writing is key here, not a devolution into one-dimensional caricatures.
But as surg3n said, I personally play video games instead of having sex. That?s why it kind of annoys me when, for example, playing Super Street Fighter IV, Capcom seem to be trying to sell me porn (hyperbole, but you know what I mean) by including a sexy teenage schoolgirl whose skirts flies up almost every time she fucking moves and practically saying, ?Look! Play as her! Masturbate!?, when all I want to do is just try out some combos and brawl with other people without a raging boner. I don?t care about sex in video games, I don?t care about romance, I just want to have fun, and video games should stop trying to pass themselves off as films.
Although, chances are, there probably is some bara eroge visual novel game from Japan that?d probably be controversial in the West.
[*I mean, heck, the entire reason Poison, originally just an enemy character in Final Fight, is notable today and included in Street Fighter X Tekken is because of her transsexual status, complete with ?hurr durr she?s got a dick? win/lose quotes from other characters in the game]