"Besides," he said, pursuing his argument in his tone of lighthearted conviction, "if I don’t go anywhere for pain—which would be a perversion of the intention of my being, and a monstrous thing to do—why should I go anywhere to be the cause of pain?
There are no more uses of "perversion" in the book.
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It was an unacceptable perversion of justice.
The library wants to assure the Internet is not used to strengthen pedophilia or other unhealthy sexual perversions.