Auntie usually refers to menstruation, and coitus is prohibited during menstruation, but if you have coitus on the last day of menstruation, you should pay attention to maintaining private hygiene and observing abnormalities in the body. 1. Maintain private hygiene: If you have intercourse on the last day of menstruation, you should pay attention to maintaining private hygiene and clean the vulva in time to minimize the chance of infection. 2. Observe abnormal phenomena: Having intercourse on the last day of menstruation may lead to infection, causing increased bleeding, abdominal pain, vulvar itching, redness and swelling. You should pay attention to observe whether there are such abnormal phenomena in your body, if so, you should consult a doctor for examination in time. If not, care should be taken to prohibit intercourse during menstruation in the future. Although there is not much vaginal bleeding on the last day of menstruation, the cervical opening is not yet completely closed, and intercourse should still be avoided. It is generally recommended to have intercourse 3-5 days after menstruation to reduce the chance of infection.