[testbro]

I'm not sure I can really make an appropriate generalisation of the broad attitude towards it. I can, however, cherry pick Diane Abbot's views because she's often called upon for soundbites and political debates. As a consequence, my comment is a subset of reality.

In this case the fears stem from the perception that children viewing porn and sexualised content is damaging. In Diane Abbot's case [1] the concern is that sexualised environments might construct inaccurate attitudes towards women/sex in children.

I suppose that falls in the first and final scenarios you gave.

[1] : http://www.bbc.co.uk/news/uk-politics-21878027

[VLM]

That's an interesting cultural observation because in the .us we have about the same attitude toward nudity, but not toward actually doing it. For example there was a huge outcry about a half time entertainment show during a major sporting event featuring a topless woman (although she wasn't having sex or anything like that, just singing and dancing). But we have plenty of TV drama shows and all that which seem to revolve primarily about having sex, and they show almost everything except the fun parts (as mentioned above) in action and that's considered great family viewing.

So in summary maybe the cultural difference is in the .us we don't ban the action but try to ban the object, but in the .uk its the opposite and they try to ban the action. That probably has some implications WRT dealing with internet censorship by avoiding the whole topic, or maybe why it seems to be hard to avoid offending someone somehow on one side of the pond or the other.