Role
Sadist.
A person whose sexual or sensual pleasure includes inflicting consensual physical pain or discomfort on a partner. Sadism is the complement to masochism in the SM abbreviation; a sadist may or may not be dominant. Distinguished sharply from clinical sadism (DSM-5 sexual sadism disorder, which requires non-consent for the diagnosis): the consenting sadist works within negotiated boundaries with a willing partner.
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