I'm not sure if there is enough, to much or "needs to be more", but it seems to me that it doesn't matter how much there is, we seem to always find the need to keep "children" and "kids" in the dark. Like some others have said, it doesn't matter much if they see any sort of violence in movies and such, but let someone be any sort of naked, and that is were the problems will start, not if he/she sees a violent movie.
Course, I'm on the fence with this. Well, at least in the sense were I think that everyone needs a healthy dose of both violence and sex, in some form, be it someone who plays GTA and watches a dirty movie, or someone who does both without the console or the television. Though the latter isn't the best of situations, it sometimes is reality.