Dominant and Submissive: BDSM Roles and Power Exchange
Dominant and submissive describes complementary BDSM roles in which one person takes agreed authority and the other voluntarily yields it.
Sadism: Erotic Pain, BDSM Roles, Safety, and Consent
Sadism is enjoyment associated with causing or imagining pain, discomfort, humiliation, fear, or submission and may appear in consensual BDSM.