The sadist enjoys inflicting pain.
The masochist enjoys receiving pain.
The opposite of a sadist would be a masochist, someone who derives pleasure from experiencing pain or humiliation themselves.
No, it is only if you enjoy being nice to a masochist.
A sadist is one who obtains pleasure by inflicting pain on others.
"The sadist had enjoyed hurting dozens, and tonight, had a special new boyfriend coming over to be beaten."
A psychiatrist would define a masochist as someone who derives sexual gratification from their own pain or humiliation, often considered a form of paraphilia. Masochism can also refer to a broader psychological trait involving a desire for self-punishment or suffering.