It is not recommended to have intercourse just after menstruation. Because the endometrium is not fully repaired at the end of menstruation and the cervical opening is still open, intercourse can easily bring bacteria into the uterine cavity and cause intrauterine infections, endometritis, cervicitis, pelvic inflammatory disease and other gynecological inflammatory diseases, which, if they continue to develop, may cause uterine adhesions and even affect fertility. Moreover, the tiny blood vessels in the endometrium are not fully restored at the end of menstruation, and there is a tendency to bleed. Mechanical movement during intercourse can cause pelvic congestion, resulting in endometrial bleeding again and incomplete and prolonged menstruation. Intercourse may also lead to reflux of residual blood during menstruation, which may easily cause endometriosis and may lead to severe menstrual cramps, which may also affect fertility. Therefore, it is recommended that women should have intercourse 2-3 days after their menstruation has just ended, and they need to pay attention to keeping their vulva clean and hygienic and wash it before and after sex to reduce inflammation. During menstruation because of the loss of part of the blood, blood iron, potassium, calcium, protein and other substances are also lost, after menstruation can be more protein, minerals and blood-supplementing food.