Women are not allowed to have intercourse during menstruation, regardless of the first day of menstruation.
Women’s menstruation is a physiological phenomenon, a special physiological period, when the body’s hormone level is relatively low, resulting in low immunity. And due to vaginal bleeding, the cervical opening will be in a dilated state, the chance of infection will increase significantly.
During the menstrual period, women must be careful not to have sex, and must pay attention to maintain the hygiene of the vulva. If you have sex during menstruation, pathogens may enter the uterine cavity through the vagina and cervix, leading to endometritis or adnexitis and other diseases, and in severe cases, pregnancy may be affected.
Generally after three days of menstruation, if the woman does not have any discomfort symptoms, this time you can have sex, basically there is no effect, but if there is no reproductive requirements, to take effective contraceptive measures.