Noun
English Wikipedia has an article on:crime against natureWikipedia
crime against nature (plural crimes against nature)
(law) Any of various sexual deviations that, at one time or another, have been considered to be so unnatural as to be illegal.
We are so inculcated with guilt that we think that weakness is a sin or that it is some crime against nature to be submissive. Anton LaVey
They consider garrulity a crime against nature. Jack Vance