Women should not have intercourse during menstruation because blood accumulates in the vagina during menstruation and because blood is a good medium for bacteria, it may cause bacteria in the vagina to travel up to the uterine cavity, leading to endometritis and pelvic inflammatory disease. As the uterus contracts during intercourse, the endometrium becomes ectopic to the myometrium or pelvic cavity leading to endometriosis. As a result, women later experience lower abdominal pain during menstruation, which becomes increasingly severe until it becomes unbearable, menstrual disorders, significantly increased menstrual flow or even anemia, and the chances of infertility increase. Under normal circumstances, women can have a normal sexual life after three days of clean menstruation, while paying attention to the hygiene of intercourse. During menstruation, it is necessary to pay attention to proper rest, keep the vulva clean and hygienic, avoid getting cold and flu, and pay attention to increase nutrition to strengthen the body’s resistance in order to help the body recover.