Hybristophilia is a paraphilia in which sexual arousal, facilitation, and attainment of orgasm are responsive to and contingent upon being with a partner known to have committed an outrage, cheating, lying, known infidelities or crime, such as rape, murder, or armed robbery. The term is derived from the Greek word ὑβρίζειν "hubrizein", meaning "to commit an outrage against someone" (ultimately derived from ὕβρις "hubris" "hubris"), and "philo", meaning "having a strong affinity/preference for". In popular culture, this phenomenon is also known as "Bonnie and Clyde Syndrome".

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.

Hybristophilia is accepted as potentially lethal, among other such paraphilias including, but not being limited to, asphyxiophilia, autassassinophilia, biastophilia, and chremastistophilia.

The reason why some people do this is unknown, but some speculations have been offered. For instance, Katherine Ramsland, who is a professor of forensic psychology at DeSales University mentions that some of the women in particular who have married or dated male serial killers have offered the following reasons:

- "Some believe they can change a man as cruel and powerful as a serial killer."

- "Others 'see' the little boy that the killer once was and seek to nurture him."

- "A few hoped to share in the media spotlight or get a book or movie deal."

- "Then there's the notion of the 'perfect boyfriend'. She knows where he is at all times and she knows he's thinking about her. While she can claim that someone loves her, she does not have to endure the day-to-day issues involved in most relationships. There’s no laundry to do, no cooking for him, and no accountability to him. She can keep the fantasy charged up for a long time."

Others offered reasons along the lines of:

- "Some mental health experts have compared infatuation with killers to extreme forms of fanaticism. They view such women as insecure females who cannot find love in normal ways or as 'love-avoidant' females who seek romantic relationships that cannot be consummated."

From a perspective focusing on male serial killers attracting female partners, Leon F. Seltzer (psychologist), has offered explanations based on evolutionary psychology. Serial killers, in his view, are cases of alpha males that tend to attract women. This is because such males were good at protecting women and their offspring in our evolutionary history. Women nowadays may consciously realize that it is unwise to date a serial killer, but they are nevertheless attracted to them, as he notes "as a therapist I've encountered many women who bemoaned their vulnerability toward dominant men who, consciously, they recognized were all wrong for them". As evidence of women's fantasy preference for dominant men, he refers to the book "A Billion Wicked Thoughts: What the World's Largest Experiment Reveals about Human Desire" by Ogi Ogas and Sai Gaddam. Seltzer discusses Ogas and Gaddam's argument that this fantasy is the dominant plot of most erotic/romantic books and movies written for women but the fantasy always holds that this male dominance is conditional, "it doesn't really represent the man's innermost reality".

Biastophilia (from Greek "biastes", "rape" + "-philia") and its Latin language-derived counterpart raptophilia (from Latin "rapere", "to seize"), also paraphilic rape, is a paraphilia in which sexual arousal is dependent on, or is responsive to, the act of assaulting an unconsenting person, especially a stranger. Some dictionaries consider the terms synonymous, while others distinguish raptophilia as the paraphilia in which sexual arousal is responsive to actually raping the victim.

The source of the arousal in these paraphilias is the victim's terrified resistance to the assault, and in this respect it is considered to be a form of sexual sadism. Biastophilia is accepted as potentially lethal, other such paraphilias including, but not being limited to asphyxiophilia, autassassinophilia, hybristophilia, and chremastistophilia.

Under the name paraphilic coercive disorder, this diagnosis was proposed for inclusion in DSM-5. This diagnosis, under the name "paraphilic rapism", was proposed and rejected in the DSM-III-R. It has been criticized because of the impossibility of reliably distinguishing between paraphilic rapists and non-paraphilic rapists, and because this diagnosis, under the term "Paraphilia NOS" (not otherwise specified), non-consent had been used in Sexually Violent Person/Predator commitment.

Czech sexology standardly use a concept of pathologic sexual aggressivity instead. This term is strongly distinguished from sadism. This disorder is understood as a coordination anomaly of the sexual motivation system (SMS), a "courtship disorder" according to Kurt Freund or displacement paraphilia by John Money, or a missing segment of SMS.