If you are suffering from certain viral diseases, it is possible to transmit them through menstruation, such as syphilis, AIDS, or hepatitis B. If you have sex while you are menstruating, you may transmit these viruses to the man because they are in your blood. If there is no sexual contact, it will not be transmitted. If the woman is suffering from a blood-borne infectious disease, she should be absolutely forbidden to have sex during her period, as the chances of transmission will be greater than the usual sexual life. Of course, if you have an infectious disease, it can be transmitted through normal sex, you should pay attention to precautions, even if it is not menstrual period also has the chance of infection. If there is no infectious disease in the body, there is no source of infection, there will be no menstruation will be infectious.