I don't know about smut laws. We are bombarded by garbage daily on TV. (Well I'm not. Don't have TV anymore) It would be a fight.
I know, so many are desensitized and empathic to the cultural sewage.
I do know that before the 60s,obscenity was illegal,the Founders would have strictly prohibited it. And at least Nixon,for all his faults,tried to do something about the rise of harmful material/obscenity.