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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.
STIs: illness, infection and/or disease which is often or can be transmitted through sexual or other intimate contact, like HIV, Chlamydia or Herpes. Some people call STIs STDs.