Masochistic

[PussyCat]

Adjective describing someone whose actions illustrate their desire to inflict pain and suffering upon themselves.
Someone who enjoys causing their own suffering.

[Becky]

Someone who gets sexual pleasure (horny) from being hurt or in pain.
Ex. When someone is:whipped, clawed to bleed, bitten to bleed, slapped, ect. and then want sex BAD.

[Tina]

getting sexual pleasure from being hurt or controlled by another person:

[Dave Paprocki]

Deriving sexual gratification from ones own pain or humiliation.