Fifty menstruating women masturbated with a wide-open speculum in place, such that it provided the researchers with an unobstructed view of the cervix. “During the terminal stages of orgasmic experience…menstrual fluid could be observed spurting from the external cervical [opening] under pressure. In many instances, the pressure was so great that initial portions of the menstrual fluid actually were expelled from the vaginal barrel without contacting either blade of the speculum.” I do so hope they wore lab glasses.
