There is no reliable prevalence rate for hybristophilia, the sexual or romantic attraction to people who have committed violent crimes. It is not recognized as a formal diagnosis in any major psychiatric manual, so no large-scale studies have measured how many people experience it. What we do know comes from behavioral evidence: thousands of people write love letters to convicted killers, show up to their court hearings, and even pursue marriage. That pattern is consistent and well-documented enough to confirm that the attraction is real, recurring, and far from a one-off curiosity.
Why There Are No Prevalence Numbers
Hybristophilia is not listed in the DSM-5, which is the standard reference for psychiatric diagnoses in the United States. The DSM-5 recognizes eight paraphilic disorders, including voyeurism, fetishism, and sexual sadism, but attraction to criminals is not among them. The ICD-11, used internationally, also does not include it. Without a formal diagnostic category, there is no clinical infrastructure for tracking cases, no screening tools, and no population surveys asking about it. The term itself was coined in the 1990s and remains largely confined to forensic psychology literature and media discussions.
This doesn’t mean it’s rare. It means no one has systematically counted it. The gap between public fascination and formal research is wide. Most of what we know comes from case studies, media reports, and the observable behavior of people who correspond with incarcerated criminals.
What the Behavioral Evidence Shows
The most concrete window into how common this attraction is comes from the mail and attention violent offenders receive. Wade Wilson, convicted of murdering two women in Florida, reportedly received around 4,000 letters from female admirers after his trial gained attention on social media. Ted Bundy received love letters and multiple marriage proposals while on death row. One woman who wrote to him during his 1979 trial described wanting “an hour alone with you” and said there was “nothing I wouldn’t do.” Richard Ramirez, the Night Stalker, attracted women who attended his court appearances specifically to see him and eventually married a pen pal he met through prison correspondence.
These are not isolated examples. Nearly every high-profile serial killer or mass murderer in the modern era has attracted some degree of romantic or sexual attention from members of the public. The pattern holds across decades, countries, and types of crime. Social media has made it more visible: fan accounts dedicated to convicted killers accumulate thousands of followers, and true crime communities sometimes blur the line between interest and infatuation.
Still, writing a letter to a famous killer and experiencing genuine sexual arousal from violence are different things. Some of these admirers may meet a clinical threshold for hybristophilia, while others may be driven by a desire for notoriety, a savior complex, or parasocial attachment to someone they perceive as misunderstood. The behavioral evidence tells us the phenomenon is widespread but doesn’t cleanly separate motivations.
Passive vs. Aggressive Forms
Researchers who study hybristophilia generally distinguish between two forms. The passive type involves forming an idealized or romantic attachment to someone who has committed violence. This is the more common presentation and includes the letter-writers, courtroom admirers, and people who develop intense emotional fixations on killers from a distance. The person is attracted to the criminal but does not seek to participate in violence themselves.
The aggressive form is rarer and more dangerous. Sometimes called Bonnie and Clyde syndrome, it describes someone who is not only attracted to a violent person but wants to help them commit crimes. The arousal is tied to the violence itself, and the person actively seeks a role in it. Documented cases of this type are uncommon, but they do appear in forensic case files involving criminal couples.
Gender and Demographics
Hybristophilia is overwhelmingly documented in women attracted to violent men. The vast majority of fan mail, marriage proposals, and courtroom admirers in high-profile cases are female. For a long time, the phenomenon was considered exclusively a female pattern. However, at least one published case study has documented hybristophilia in a man attracted to a female serial killer, a finding the authors noted had not previously appeared in the literature. The scarcity of male cases likely reflects both genuine gender differences and a lack of research attention rather than true absence.
Why It Happens
Several explanations have been proposed, and none of them alone fully accounts for the phenomenon.
From an evolutionary psychology perspective, there is evidence that women can be drawn to signals of dominance and aggression in men, particularly as short-term partners. Research published in PMC found that women in their fertile window showed a stronger preference for men who exhibited what researchers call appetitive aggression, essentially men who experience a sense of reward from being violent. The theory is that throughout human history, men willing to fight and dominate competitors may have signaled genetic fitness and an ability to protect offspring. This does not mean the attraction to killers is “natural” or inevitable, but it suggests that some of the underlying wiring that makes dominance appealing could be amplified in hybristophilia to an extreme degree.
Psychological explanations focus more on individual factors. Some people are drawn to the perceived intensity or emotional depth of someone capable of extreme acts. Others experience a “beauty and the beast” fantasy in which they believe they can change or redeem a dangerous person. The safety of prison walls also plays a role: a relationship with an incarcerated person offers emotional intensity without the physical risks of actually living with a violent partner. The person controls the pace and boundaries of the relationship in a way that wouldn’t be possible outside prison.
Media exposure is another amplifier. True crime content has exploded in popularity, and repeated exposure to detailed narratives about killers can create a sense of familiarity or even intimacy with them. When a trial goes viral on social media, the sheer volume of attention can normalize the idea of finding a defendant attractive, lowering the social barrier to expressing that attraction publicly.
Where the Line Falls Between Interest and Paraphilia
True crime is one of the most popular entertainment genres in the world. Millions of people consume podcasts, documentaries, and books about violent criminals without experiencing any romantic or sexual attraction to them. Finding a case fascinating is not hybristophilia. The distinction matters because the term specifically refers to sexual arousal or romantic desire directed at someone because of their violent acts, not despite them.
Among the broader population of true crime fans, the subset that develops genuine romantic fixations on criminals is small. Among that subset, the number who experience it as a persistent sexual pattern (rather than a passing fascination) is smaller still. And among those, the aggressive form where someone would actively participate in violence is exceptionally rare. Think of it as a funnel: each level narrows considerably, but the widest part of the funnel, general interest in violent crime, is enormous, which is why even a tiny percentage translates into thousands of letters and visible fan communities.
The honest answer to “how common is hybristophilia” is that no one knows the precise number, but the behavioral footprint it leaves is large enough to be unmistakable. It shows up reliably every time a violent crime captures public attention, across cultures and decades. Whether that reflects a rare paraphilia surfacing in a small number of people or a milder, more widespread tendency that most people never act on remains an open question in forensic psychology.