Answer to your question is because America is a police-state.
yeh but so is europe.....actually worse when it comes to political correctness and forced equality
but europeans do not seem to have the fragile sensibilities that americans as a whole see to harbor towards sex and other blue material
also europeans seem to be more irreverant when it comes to commercials....they go out farther on the limb...........im america it is all about hammering home your product in a commercial.......whereas in europe commercials are more roundabout in how they address the product that is the topic