When the endometrium starts to peel off at the time of menstruation, it is not possible to have intercourse and it has nothing to do with how much, as long as it comes. If you have intercourse during menstruation, the uterine cavity and fallopian tubes will be connected, causing endometrial tissue to migrate to the pelvis, resulting in chocolate cysts and adenomyosis, which may also cause tubitis and pelvic inflammatory disease. Some women may also suffer from fever and even severe abdominal pain, which may cause menstrual dripping, and they may not be able to have intercourse during menstruation even if they have a little bit of it. You must pay attention to personal hygiene during menstruation, change your underwear every day, change your sanitary napkins every four hours, and wash your vulva every day to avoid cross-infection.