Kid Various played thousands of hours of Donkey Kong. He has yet sneak into construction sites to chase gorillas.
The idea that video games and explicit media content are a threat to society is demonstrably false. Whatever evidence there might be that violent media content causes violent behavior, or that graphic sexual content stimulates unhealthy sexual behavior, there is a simple test that invariably proves otherwise. Buy the game and then take some time to play it over the next few days or weeks — however long you feel is necessary for a proper test (keep in mind that Grand Theft Auto IV involves at least 25 hours of narrative development, more if you actually decide to play the game instead of just following along with the story).
After you're done, 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?