It's not that simple, the grey area is vast. Take song lyrics for example, if it were illegal for lyrics that depict violence to be heard by minors they would never hear a song like John Hardy (the list is endless), they would loose a good chunk of all the lyrics ever written. Should kids be kept from watching the 3 Stooges, I've never seen as much violence in my life?(... Maby they should, HaHa)