When menstruation has just come, although the endometrial lining is shed slowly and bleeding is very little, having intercourse at this time will still have certain effects. There may be endometrial inflammation, pelvic inflammatory disease and tubal inflammation because the tubal cavity and the uterine cavity are connected. When the endometrium is shed, the endometrium will reach the pelvic cavity with the swing of the cilia, causing endometriosis to occur. It can also cause high fever, abdominal pain, and may even cause menstrual dripping. In such cases, it is important to go to the hospital for examination, and anti-inflammatory and hemostatic treatments should be performed. During menstruation, the male partner’s genitalia may contain certain bacteria, and intercourse at this time may also lead to cross-infection, especially during menstruation, when good hygiene is not observed, there may be vaginitis.