I'm typically not into conspiracy stuff but it's a possible one really. If the advertisers that fund the budgets of the major US TV networks wanted them to be uncensored from nudity and sex, I believe it would happen.

It certainly would help explain the confusion of why graphic violence is tolerated and embraced on US television daily and showing some dude's butt on NYPD Blue was some monumental occasion.

Sex is too valuable of a tool to dilute.