No, but it is a physiological phenomenon unique to women during menstruation. During the menstrual period, various parts of the body will undergo some changes. The most prominent changes are: the excitability of the cerebral cortex decreases, and the body's resistance ratio decreases. Usually poor. The endometrium in the genitals sheds and bleeds, the uterine orifice opens, the alkaline menstrual blood neutralizes the acidic environment of the vagina, the vaginal acidity decreases, and the natural barrier function is weakened. If you have sex during menstruation, it will appear The following adverse consequences: First, due to the excitement of both parties, penile insertion will cause congestion of the female genitals, resulting in increased menstrual flow and prolonged menstruation. Second, during sexual intercourse at this time, the male genitals may bring bacteria into the vagina, and menstrual blood is a good source of bacteria and other microorganisms. Culture medium, bacteria can easily breed, spread along many tiny wounds and broken small blood vessels in the endometrium, infect the endometrium, and even involve the fallopian tubes and pelvic organs, thus causing unnecessary trouble to the woman. The third is menstrual secretion If the substance enters the male urethra, it may also cause urethritis. Fourth, sexual intercourse during menstruation, because the sperm meets the overflowing blood cells in the damaged endometrium and even enters the blood, which can induce the production of anti-sperm antibodies, leading to immune insufficiency. Pregnancy, infertility. Fifth, sexual intercourse during menstruation. Due to uterine contraction during sexual impulse, endometrial fragments can also be squeezed into the pelvic cavity, causing endometriosis and leading to infertility.