I wasn't supposed to watch MTV when I was younger. I can't remember when we were actually allowed to because we did it anyway when they weren't around. I mostly watched Beavis and Butthead. I barely cared about the other stuff they showed.
I wasn't allowed to see any R-rated movies until I was 11 when other kids were watching them in first and second grade; but alot of them didn't like The Land Before Time because the part where mom got killed was too much for them so I don't know WTF was going on there.