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Preversions are acts commited by preverts, i.e. people who preempt the actions of perverts by doing to a pervert what a pervert would have done to them.
"So what preversions do we know of Inspector?"

"Well there's the reverse jackson, the funky trap, the shepherd's delight and the razorblade romance."

"Nasty stuff, nasty stuff."

"Yes. Beware of the prevert perverts, beware!"
by H.S. Willsy August 23, 2011