Oh, yeah, put the brakes on scatological porn and what's left but that?!? Trouble is, you don't even know how foolish that is because you think in cliches.
What you really want to protect is not free speech (or free anything, for that matter) but porn, drugs and other socially harmful ills. That's what libertarianism is all about: providing government protection for vice. For that reason, I think you have much more in common with the radical left than with the religious right.
It's interesting that even Max Hardcore doesn't depict rape. The girl gets choked and abused, but she just sort of passively goes along, never losing that drugged-out thousand yard stare.
The only media I've ever seen that really glorifies straight-up rape are those Japanese Hentai cartoons (The Japanese are sick, repressed bunch).
There was a guy named Greg Dark who was making violence-themed porn films and they shut him down pretty quick.
That's the only line left these days.
There's no thinking going on in minds like that. It's the Beavis and Butthead philosophy. Actually they're probably more civilized and mature in viewpoint.