It is not recommended to have sex immediately after menstruation, because when menstruation comes, the cervix is slightly open, and there will be fresh trauma in the uterus. When menstruation is just clean, the cervix is not completely closed, the endometrium is not completely repaired, and there will be fresh trauma in the uterine cavity. cause acute endometritis. The bacteria can infect the pelvis through the fallopian tubes on both sides, causing acute pelvic connective tissue infection, which is not good for women’s health, so it is not recommended to have sex immediately after menstruation.