IsMasochist is a char.dat script tag that designates the character as a masochist. Allied masochist characters can be punished by the player so long as the player is wielding a sadist weapon (belt, whip, [[banana]], banana peel, broken bottle, [[nut]], bodypart). Players can also kick masochist allies with no penalty, as long as they have "be nice to pets" disabled in the options menu.
[[Sadist]]s will occasionally attack friendly masochists for fun.