Can a girl have sex when she has her period?

Women in menstruation is absolutely prohibited sex life. Because menstrual cohabitation is easy to cause uterine infection, may also cause endometriosis. Menstruation endometrium will peel off, there are wounds in the uterus, menstrual blood along the cervical orifice flow out, so the cervical orifice is also slightly open state, this stage of uterine resistance is the worst. When cohabitation may bring dirty things in, causing uterine infection. In addition, cohabitation may stimulate uterine contractions, causing menstrual blood to flow back to other parts of the pelvis, thus causing endometriosis.