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The first psychiatrist to look closely at the more extreme forms of sadistic behavior was the eminent German physician Richard von Krafft-Ebing. Besides coining the term “masochism” (named after the Austrian writer Leopold von Sacher-Masoch, whose famous novel, Venus in Furs, deals with a man who craves humiliation), Krafft-Ebing made a major contribution to the literature of morbid psychology with his classic book, Psychopathia Sexualis—a massive compendium of every known perversion, illustrated with hundreds of detailed case histories. At the time of its initial publication in 1886, the book was considered so shocking that its author was nearly expelled from the prestigious British Medico-Psychological Association. Even today, it makes for deeply disturbing reading. Still, it is a significant work, one that clearly demonstrates there’s nothing new about serial murder. Of course, Krafft-Ebing doesn’t use the term “serial murder,” which wouldn’t enter the language for another hundred years. The term he uses is the German word lustmord or “lust-murder.” The essence of this crime is extreme sadistic violence against the victim. The lust-murderer doesn’t just kill his victims. His ultimate pleasure comes from savaging their bodies: disemboweling them, cutting out their genitals, etc. For such blood-crazed sadists, violence is a substitute for sex.
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Harold Schechter (The Serial Killer Files: The Who, What, Where, How, and Why of the World's Most Terrifying Murderers)