It is not possible to have intercourse during the menstrual period. The damage to women’s bodies is relatively large, and it is harmful in the following ways: First, the cervical opening is looser during menstruation, and there is blood in the vagina, so intercourse at this time is particularly likely to cause upstream infection, leading to pelvic inflammatory disease. The pelvic inflammatory disease can cause endometrial adhesions or tubal adhesions, so it has a significant impact on the patient’s health and fertility. Secondly, if you have intercourse during menstruation, the menstrual blood may flow backwards down the fallopian tube into the patient’s pelvis under the effect of mechanical stimulation and collision during intercourse, so that you are prone to endometriosis. Endometriosis can cause dysmenorrhea and even pelvic adhesions in patients, which can also affect their health and fertility.