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The flow during menstruation, composed mostly of endometrium, including blood. Sometimes flow contains portions of the endometrium as solid tissue, which is often confused with blood clots.

Someone who has had or is currently having some kind of genital sex with a partner or partners.

Rubbing against the body of another person to express sexual feelings or seek out sexual pleasure. “Dry frottage” is done with clothing on (“Dry humping” is a form of frottage).