Sex in games isn't going to be anything more then a porno that you put time into to unlock. The idea that we need to view a sex scene is a bit appalling enough, implication and the imagination is alot stronger anyway, and it shows more class from a reviewing stand point. Like many who have already put there 2 cents on the subject, developers aren't selling intimacy or a sexual outlet, there selling a game. Full of enjoyable game play, linear to non linear narratives, and healthy escapism preferably. The only slight exception I have to this rule, oddly enough is rape.
I don't dignify rape or condone it, but viewing sex is awkward when it isn't suppose to be, viewing rape is suppose to be visceral, tragic, and grotesque even. Implying rape may have more class, but depicting it --with tact of course-- will have more meaning. I'm not saying make a hentai game about people getting rapped all the time, but I am leaving the window open for a developer with a great story to include something truly evoking in there work. Honestly, its something I have never even heard of being in a game.
I mean GTA has sex, Fable has sex, most western RPGS include it, but not rape really. You can't just run over and have sex with someone forcibly, you have to woo them generally speaking, and in all honesty, I don't understand female leads who are anti male or shut off for only a few social dilemmas. However, if a woman was sexually assaulted or even a guy? That would be such a traumatic experience in and of itself that it could be understood why he or she would have scorn for something at extreme lengths.
Although the controversy would probably be worst then the hot coffee scandal, and last even longer, I think were a way off from getting this done right, and doing this will require some true tact. And again, I'm not saying that viewing this drawn out scene of a woman getting rapped is OK, but a scene, if just brief to get the idea would be truly frightening, and forms good character development. I just think it's something purposely avoided in games that has the power to make a GREAT game, if just for getting the scene off right.