The sexually sadistic criminal and his offenses.

P. E. Dietz, R. R. Hazelwood and J. Warren,
Bull. Amer. Acad. Psychiatry & the Law 18(2): 163-78, 1990.
This is an uncontrolled, descriptive study of 30 sexually sadistic criminals. All were men, and all intentionally tortured their victims in order to arouse themselves. Their crimes often involved careful planning, the selection of strangers as victims, approaching the victim under a pretext, participation of a partner, beating victims, restraining victims and holding them captive, sexual bondage, anal rape, forced fellatio, vaginal rape, foreign object penetration, telling victims to speak particular words in a degrading manner, murder or serial killings (most often by strangulation), concealing victims' corpses, recording offenses, and keeping personal items belonging to victims.