I have to go with what this guy said. ^Eisenfaust said:same as with dvd's, rough, gory and full of sex...
a game with sublety, nuance and restraint is normally classified as "good"
Although, in reality, I wouldn't consider either "adult." When something completely relies on being full of gore and sex in an effort to be "mature" in my eyes that just makes it more childish.
However, I feel that most kids can appreciate when something is subtle, nuanced, and restrained. So, I wouldn't necessarily say that those things are "adult," because I feel that even a child with a reasonably functioning brain can enjoy them.