There was an episode of South Park where everyone acted very strange around a videotape. The South Park Kids thought it was a Lord of The Rings video tape when in actuality it was a porn tape in the Lord of The Rings video case. The episode challenges the notion of harmful to minors.
There was an episode featuring Alien sex and the South Park kids knew enough to videotape it for use as blackmail later. Also challenging the notion of harmful to minors.
What upsets me is the lack of angry mobs when many of these controversial things aired. Why no angry mob?