It is not possible to have intercourse during the period of menstruation. Because the period comes, indicating that the endometrium is shedding, there is trauma inside the uterine cavity, the cervical opening is open, if coitus is very easy to cause bacterial upstream infection, endometrial inflammation, affecting the uterus to recover. In addition, menstrual blood is prone to reflux, thus increasing the risk of endometriosis. If you have endometrial inflammation as well as endometriosis, it is easy to cause non-pregnancy in the future, and it has a great impact on your health, which is easy to have lower abdominal cramps, hidden pain, unpleasant intercourse, or painful symptoms of coitus. Therefore, for the sake of your health, you should avoid having intercourse during menstruation. Usually coitus should also pay attention to both external genital cleanliness, wash the vulva with warm water every night, to avoid gynecological inflammation. In addition to coitus to take reliable contraceptive methods, such as the application of short-acting contraceptive pills or condoms, intrauterine device.