The last day of the menstrual period is also not conducive to women’s health, menstruation due to the lower level of sex hormones, the vagina and the upper reproductive tract defenses are also reduced, it is easy to be infected by external pathogens in the stage. In addition, the menstrual period due to irregular contraction of the uterus, menstrual blood out of the body, so the cervical opening is also in an open state, at this time if sex, it is easy to bring bacteria into the vagina to cause vaginal inflammation, and inflammation is easy to open the cervix along the uterus into the uterine cavity, fallopian tubes or even to the pelvis, triggered by the inflammation of the upper reproductive tract. The last day of menstruation, although the bleeding is relatively small, but there may still be residual blood in the uterine cavity, sex may prevent the flow of menstrual blood, or even lead to menstrual blood along the fallopian tubes into the pelvic cavity, there is a risk of endometriosis, so menstruation should be strictly prohibited sex, to develop good sexual habits, to maintain women’s reproductive health.