Back and forth, this study, that study, this source, that source. The argument goes on for pages and pages. What is not really being addressed is any logic behind the stance and what, exactly, the stance is.
Jungle, what IS your point? What do you think should be done about it?
Going back to the OP, do you think that same-sex relationships should be shown and treated like opposite-sex relationships in the public? Do you believe it inappropriate for teens (because, let's face it, it's not like 8y/o's are playing a lot of MMORPGs) to see in video games what they can see in real life in schools and grocery stores and in their work places? If so, why? Why should video games be censored when real life isn't?
Secondly, and really completely off-point of the OP, if you are against same-sex couples adopting children because (and no "studies" here please, just your opinion) you feel they are in general worse parents than heterosexuals, then why do you not feel it is appropriate to either prohibit homosexuals from having biological kids OR removing biological children from their homes entirely? I mean, if they are such dangerous parents to you, why stop at just adoption prohibition? Why do you only seem to "care" about the welfare of the kids who need homes the most? What of the kids already in these "dangerous" homes? Seems pretty inconsistent to me. Either you really believe that children should not be in the care of homosexuals and should therefore be denied having children across the board OR you are just trying to concoct some kind of "reasonable" argument to back up your prejudiced stance.