noun. A person who enjoys both inflicting and receiving pain for sexual gratification.

noun. someone who enjoys both sadism and masochism

"I think this is because what they expect of a sadomasochist is a freak, an anomaly, a drooling pervert who lures children into dark alleys."

masochist  sadist  sadomasochism  sadomasochistic  

degenerate  deviant  deviate  pervert