Again, all this is proving is that sex in the game can hurt the game more than help it. All my personal feelings aside, if the game is good, it doesn't need it. If not, it isn't worth playing anyway.
And if sex in the game isn't done right, it is going to only make the game less appealing to players.
So, like I've said before, no sex, bigger potential audience. Sex in game, more likely to limit audience.