A search for answers on the subject of sadomasochism: its origins, forms and functions, nature, and societal status. An international group of distinguished psychiatrists, psychologists, and psychoanalysts investigate the riddle of sadomasochism from heuristic, ontogenetic, nosological, psychodynamic, sociocultural, and therapeutic perspectives. With contributions from Prachi Akhavi, Salman Akhtar, Ruth Axelrod-Praes, Lisa Crilley, Victoria Curea, Tom DeRose, Nilofer Kaul, Otto Kernberg, Arsalan Malik, Jack Novick, Kerry Kelly Novick, Philip A. Ringstrom, Louis Rothschild, Asmita Sharma, and Benny Weiss-Steider.