According to social psychologist Eliot Aronson, for example, it is undeniable that some people are influenced by the violence they are exposed to on the various media. There are four reasons for this: media violence lowers previously learned inhibitions against violence; it provides ideas about how violence might be perpetrated; it makes aggression a more readily available response; and it numbs people to the horror of violence.
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We also know that age-ratings don't work. A recent Gallup poll, for example, found that more than 70% of teenage boys in the US had played the GTA games. It is slightly strange then that what people have worked themselves up into a lather about is just a little bit of sex.