Necrophilia, also called thanatophilia, is a sexual attraction or sexual act involving corpses. The attraction is classified as a paraphilia by the Diagnostic and Statistical Manual (DSM) of the American Psychiatric Association. The term was coined by the Belgian alienist Joseph Guislain, who first used it in a lecture in 1850. It derives from the Greek words νεκρός (nekros; "dead") and φιλία (philia; "love"). Rosman and Resnick (1989) reviewed information from 34 cases of necrophilia describing the individuals' motivations for their behaviors: these individuals reported the desire to possess a non-resisting and non-rejecting partner (68%), reunions with a romantic partner (21%), sexual attraction to corpses (15%), comfort or overcoming feelings of isolation (15%), or seeking self-esteem by expressing power over a homicide victim (12%).