He's written extensively about psychopathy and aberrant sexuality. In Violent Attachments, he discusses the fact that sadistic psychopaths are more likely to relate to people in terms of power than affection. They commit crimes with more violence than other types of offenders, and in general are more aggressive. Psychopaths are callous, without remorse or empathy, and often predatory. They move about with planning and purpose, and what most gratifies them is the omnipotent control of others. Among the characteristics Meloy finds in this type of offender are: � Impersonation of law enforcement � Abduction of victim to a preselected location � Binding of the victim � Emotional detachment during attack � Rape often leads to murder, usually by strangulation