In the 1980s, the Reagan administration really attempted to crack down on pornography, and sought to eradicate it. I'm not an expert, but I do believe there were raids on sets and so forth, or at least fears of them. The critical point of this came with the Tracy Lords scandal, which gave the Federal government a macguffin to really go after the pornography industry, and it nearly brought it down.
So what if Reagan and the religious right got their wish, and managed to wipe out pornography?