Masochism (noun)

1. The act or habit of seeking pain or discomfort as a source of pleasure or satisfaction.
2. The pleasure one gets from being humiliated, punished or physically hurt.

Origin:

From german masochismus, named after leopold von sacher-masoch, an austrian writer whose works often featured themes of sexual submission.

Examples:

1. The patient's self-harming tendencies were diagnosed as masochism.
2. His masochism is why he enjoyed punishment in the bedroom.
3. The masochism in him made him want to be hurt by his partner.
4. Some people argue that masochism is a form of self-care.
5. The masochism of the protagonist of the book was hard to understand.