The things you mention should be covered in gaming review sites. Now maybe you think the magazines should just list these elements as well, but here is the situation, my 8 or 10 year old has requested I buy some innocuous sounding racing game. I’m at the store, I but it. We get it home and there are big busted ladies jumping around and possibly occasionally losing their tops.
Now you may have decided I’m a prude and that it’s OK for my 8 or 10 year to see these things, but really that isn’t your call. I didn’t ask for censorship, I just asked for informative labeling on the product similar to food.
How to achieve that fair labeling may be neigh-on-impossible, but there is nothing I see wrong with the goal.
Of course you may worry that if these elements are labeled then people like me might hurt sales of games with titillating sex and violence thus making for fewer of these available – because a pretty good number of Slashdotters think people should be mature enough to handle nudity, sex, and violence at all ages and that parents isolate their children too much, or that the parents should invest time researching a game before buying (which I concede to some small degree as a fair point). Still I would contend we should make it easier for people to make informed decisions, especially parents.