““It is believed that 90% of serial killers are driven by a motive of sexual nature, and only 10% are driven by other types of motivations. Penetration is not necessary for considering a serial killer’s impulses to be sexual. Serial killers’ minds associate sex with death. They are full of fantasies which increase their sexual desire, but its completion is the victim’s death, not necessarily the sexual act. (...) Some of them are impotent in practice, although they may have an erection when they kill.””
