Psychopathia Sexualis: eine Klinisch-Forensische Studie (Sexual Psychopathy: A Clinical-Forensic Study, also known as Psychopathia Sexualis, with Especial Reference to the Antipathetic Sexual Instinct: A Medico-forensic Study) is an 1886 book by Richard Freiherr von Krafft-Ebing and one of the first texts about sexual pathology. The book details a wide range of paraphilias and focuses on male homosexuality/bisexuality (the "antipathetic instinct" of the subtitle). The book coined the terms "sadism and masochism" as well as borrowing the term bisexual from botanical language.

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Masochism, which Krafft-Ebing focuses on at length, is for example defined as a particular erotic sensibility, in which the individual is, "in his sexual feelings and thoughts, dominated by the idea of being absolutely and unconditionally subjected to a person of the other sex".^[1]

The Psychopathia Sexualis is notable for being one of the earliest works on homosexuality. Krafft-Ebing combined Karl Heinrich Ulrichs' Urning theory with Bénédict Morel's theory of social degeneration and proposed the theory that most homosexuals have a mental illness caused by degenerate heredity.

The book had a considerable influence on continental European forensic psychiatry in the first part of the 20th century. It is regarded as an important text in the history of psychopathology.^[2]

In 2006, an independent film based on the book was made in Atlanta; the film was titled Psychopathia Sexualis.^[3]

• the first edition was published in 1886
• at least 12 editions of the book were published in German prior to Richard's death in 1902
• in 1965, an English translation derived from the 12th German edition was written by Franklin S. Kaf, with an introduction by Kaf and a foreword by Joseph LoPiccolo