Sexual Sadism

Sexual sadism is infliction of physical or mental suffering (eg, humiliation, terror) on the sex partner to stimulate sexual excitement and orgasm.

Most sexual sadists have insistent, persistent fantasies in which sexual excitement results from suffering inflicted on the partner, consenting or not. Mild sadism is a common sexual practice; when it becomes pathologic is a matter of degree.
Most sadistic sexual behavior occurs between consenting adults. As is the case with masochism, sadism is usually limited in scope and not harmful. in some people, the behaviors escalate to the point of harm. When practiced with nonconsenting partners, sexual sadism constitutes criminal activity.
Treatment option is usually psychological but it is uncommon to be successful in treating this disorder completely.