M-jō M嬢
Japanese term for a masochistic woman, widely used in Japan for the woman being tied; related terms include S-jō and M-otoko.
M-jō joins M, for masochist, with jō, “woman” or “girl” (Andrea Ropes); Shibari Study defines it as a female masochist. Andrea Ropes calls it the most widely accepted Japanese term for the person in rope, though some performers prefer model. Kinbakuwiki, which writes the word エム女, says that amateurs in Japan commonly describe themselves as M-jō or ukete, and gives M-otoko, a masochistic man, as the male counterpart. Shibari Study also lists S-jō, a sadistic woman.