During menstruation, women's body resistance decreases, bacteria are easy to invade, and menstrual sex may cause symptoms such as endometritis and metriosis during menstruation. Sex during menstruation is prone to infection. Because the cervix is open during menstruation, the endometrium peels away to form menstruation. During sex, germs are easy to invade the open cervix to reach the uterus, and menstrual blood is a good medium for bacteria, and women's low body resistance during menstruation is also one of the reasons for easy infection. After infection, it is easy to suffer from endometritis, endometriosis, uterine myadenosis, osteopelitis, etc., which seriously endangers women's health and even causes infertility. However, recently, after a large number of empirical investigations, a US institution has come to the conclusion that physiology will not have a psychological impact on both parties other than that of a foreign party, and it can be carried out freely. When we...