As U.S. TV and radio broadcasters continue to tread an unusually cautious route through the latest “obscenity” minefield laid out by politicians and the FCC, the impact such crackdowns can have on popular culture is beginning to be assessed. No big media company wants to be made an example of for crossing the Puritanical line being toed by FCC chairman Michael Powell, but at the same time, no one seems to be terribly clear where that line is.