I think you are stuck on the rights for titillation through story and art where the "story" is told as a means to excite the reader sexually and as part of a larger collection of erotic reading.

When I was a kid, I had the collection of books "Truly tasteless jokes" - 90% of the jokes would have you behind bars if acted out. But it's a collection of "jokes" and compiles in a larger collection of "Jokes"

It's the intention behind the works, not so much the works them self.