Purity is not imposed upon us as though it were a kind of punishment it is one of those mysterious but obvious conditions of that supernatural knowledge of ourselves in the Divine which we speak of as faith. Impurity does not destroy this knowledge it slays our need for it.
When I started in the business there was a thing called adult fantasy but nobody quite knew what it was and most publishers didn't have an adult fantasy list. They had science fiction lists which they stuck a little bit of fantasy into.