Ejaculation during menstruation may produce anti-sperm antibodies and also increase the probability of gynecological inflammation, heavy menstruation, endometriosis and other diseases. Because of the lower resistance of the female body during menstruation, coitus at this time will not only easily cause vaginitis, endometritis and other gynecological inflammation, and at the same time, due to sexual stimulation of the female immune system to increase the production of anti-sperm antibodies, which affects the normal birth of children. Meanwhile, for women who have intercourse during menstruation, as sex will stimulate uterine contraction, which will promote the stripping of the endometrium, so the patient will have a heavy menstrual flow, accompanied by a large number of clots and other clinical symptoms, and in severe cases, there will be dizziness, fatigue and other discomforts. It may also cause endometriosis. For menstruating women, it is not recommended to have sex, but also pay attention to keep warm, pay attention to rest, maintain a happy mood, if a woman is actively preparing for pregnancy and still not pregnant, it is recommended to go to a regular hospital gynecology consultation, clear cause of the cause of the disease under the guidance of the doctor active treatment.