Europe is much more relaxed about nudity (exposed breasts in prime time TV are fine) but much more restrictive about violence and gore. Instead US companies enforce US standards on us.

Even child porn isn't an easy subject. Everyone can agree that liking 12 year olds sexually is pedophilia and images about that are child porn. But when we are taking about 16 year olds it's muddier since we are taking about child porn outside of pedophilia.

And that's just (north western) Europe who are culturally very similar to the US.