[Epyon MX]

The MPAA and the movie ratings aren't law either. And there's no law on which books you can sell to which age.

Are there laws on buying pornography? I think that's the only case of true law enforcement. But pornography is gratuitous and explicit. No games are like that.

So no, not a law. And besides, it seems like the self-regulation is working. The Mature 17 year old enforcement is far better than the R 17 year old enforcement.