SADISM
sadism
(noun) sexual pleasure obtained by inflicting harm (physical or psychological) on others
Source: WordNet® 3.1
Etymology
Noun
sadism (countable and uncountable, plural sadisms)
(chiefly, psychiatry) The enjoyment of inflicting pain or humiliation without pity.
Achievement of sexual gratification by inflicting pain or humiliation on others, or watching pain or humiliation inflicted on others.
(in general) Deliberate cruelty, either mental or physical, to other people, or to animals, regardless of whether for (sexual) gratification.
Source: Wiktionary