From Citizendium, the Citizens' Compendium
Sadism: A condition in which there is a derivation of pleasure from inflicting pain, discomfort or humiliation on another person or persons. The sexual significance of sadistic wishes or behavior may be conscious or unconscious.
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- Pain : Unpleasant feeling or hurtful sensation that is conveyed to the brain by stimulation of sensory neurons.
- Paraphilia : A sexual desire or behaviour that involves an nonreproductive source of gratification.