Where in the Constitution does the Federal Government have the authority to ban, or promote the purchase of any economical product? The Enumerated Powers don't give them that right.
State governments have such authority, but the people can vote with their feet, and move to a state where the sale is legal.
Of course, after the Civil War, who gave a damn about the Constitution anyway?
EDIT: Going along the lines of "games as art" I have to point out the incredible amount of violence and nudity found within classical pieces of Art, and much of great writing. Now, nudity does not always equal sexuality, but it's presence in video games doesn't mean that it's not art. The way it's presented is what matters.
If a game is being shockingly violent just to be violent, then it loses it's purpose. If a game has nudity, or sex JUST to have nudity and sex, it loses all value. Violence can convey powerful messages that cannot be expressed otherwise. The human body can be a beautiful thing, and when shown in a wholesome sense, nudity is incredibly artistic while not being overtly sexual.
But to remove those intrinsic parts of reality from a medium originating from reality on the simple merits that it's deemed "unhealthy" is to deny our human nature, being born naked into a violent world.
In short, I don't think it's the Government's right to tell us what we are allowed to buy, or not to, but I think that parents should be doing a better job of taking care of their children, and less about worrying about whatever is taking their time away from their kids.
