It is generally recommended to have sex 3-7 days after menstruation. If you have intercourse during menstruation, it may cause reflux of menstrual blood, which may lead to endometriosis and long-term menstrual pain in the future. In addition, during the menstrual period the mouth of the uterus is open, if intercourse may cause bacterial infection, resulting in pelvic inflammatory disease, so try not to have sex during the period. During menstruation, you should also pay attention to hygiene habits, change sanitary pads regularly, change sanitary pads every 1-2 hours, wash your vulva every day, keep it clean, avoid spicy and stimulating food, avoid drinking alcohol, etc.