...ask yourself a few straightforward questions: Do you want to go outside and steal a car? Do you feel the need to obtain a missile launcher? Do you feel like having sex with a stripper? Or, to more accurately represent the sort of reasoning involved in media-effects claims, do you feel that having sex with a stripper is now a real possibility for you?
You need to be honest with yourself. Go outside and find a locked car — or go to the back alley where missile launchers hover in a glowing light waiting for you to pick them up, or go drive down that street in your town where all the strippers hang out waiting for you to pick them up — and see if you're tempted.
The Chronicle has a great article today on Grand Theft Auto and the effects of other "explicit media" on our society.