The obtaining of sexual pleasure from sadism (= hurting other people) and from masochism (= being hurt)

When you eat dirt for the first time and leave your family to build a shack in the woods

Sado-masochism is a combination of the words sadism, meaning to take pleasure in inflicting pain on others, and masochism, to take pleasure in pain inflicted on you. Together, the term sado-masochism refers to a wide spectrum of kinky sex relating to pain.

the deriving of pleasure, especially sexual gratification, from inflicting or submitting to physical or emotional abuse.

named after the Marquis de Sade (1700's), it is the act of sexual pleasure through deliberate infliction of pain and most often involves role playing

a sexual life style that a person lives in which sexual pleasure is derrived from giving or recieving pain.

A faction of the BDSM lifestyle shared by many people globally. It is named for both Marquis de Sade (120 Days of Sodom) of noble French birth and also for Leopold van Sacher Masoch (Venus in Furs). Both writers represent the two extremes of the spectrum. Sade represents male dominance, while Masoch represents male subservience. Hence the word we use today is a combination of the two.