Hybristophilia (also known as the Bonnie and Clyde Syndrome) is a form of paraphilia (or perversion) involving sexual attraction to people who have committed some sort of “outrage”. The term is usually associated with fans of notorious criminals.
Many high-profile criminals, particularly those who have committed atrocious crimes, receive “fan mail” in prison that is sometimes amorous or sexual, presumably as a result of this phenomenon. In some cases, admirers of these criminals have gone on to marry the object of their affections in prison.