a sexual perversion characterized by pleasure in being subjected to pain or humiliation especially by a love object -- compare SADISM : pleasure in being abused or dominated : a taste for suffering

( Noun) One who finds deep emotional fulfillment from being put into calculated, measurable, controlled pain, though ultimately safe from any real or permanent harm. Implies both those who seek consensual arrangements as well as those who are not concerned with the conscious consensuality on the part of the one inflicting the pain.

A person who likes pain and gets sexual excitement/satisfaction from it. There are different kinds of masochists. Some will like any kind of pain and others will only like pain in a sexual context.

a person who likes a cold shower in the morning, so he takes a hot one

a person who likes to torture himself