Not wishing to stereotype cultures here, since of course there are exceptions to this
but...
In general I have come to the conclusion that American TV/Movie culture is far more concerned about Sexual things than Violence, at least in comparison to the UK where I live.
You would be shocked at some of the things that are on TV in England at 10 or 11pm (and it is easy for a child to stay up past bedtime) or even in some cases 9pm. Graphic programs giving sex tips and the history of pornography for example.
Even before 9pm you get frank discussions of sexual orientation, sexual health and other topics.
When I have been in the states, I see very little of this, but similar amounts of violence to English TV. Of course, this must come with the caveat that I have not seen all american networks, just some of the mainstream ones, so dont assume I am assuming this is a black and white thing. More different shades of grey