Conversely, there are people who identify as genders other than women, such as trans men, intersex and non-binary people, who do menstruate.
Ac i’r gwrthwyneb, mae yna bobl sy’n uniaethu â rhyweddau ar wahân i fenywod, megis dynion traws, pobl ryngrywiol a phobl anneuaidd sydd yn cael mislif.