Do I really need to go into some of the things that used to be inappropriate for American TV? Once upon a time, married couples (married couples!) were not allowed to be shown sleeping in the same bed. You could show cleavage (to some degree) but not *bellybuttons*. Mentioning "going to the bathroom" was utterly verboten.
Most of this was long ago, but remember, only a few years ago the whole nation was whipped up into a puritanical furor over a pasty-covered breast shown at the Super Bowl.