There are several reasons why two people can bleed during intercourse: First, the timing of intercourse is not right. Many patients choose to have intercourse when their menstrual period is about to come, when the pelvis is in a state of congestion and intercourse causes uterine contraction, which leads to bleeding. In addition, when the menstruation is not completely clean, there is still a small amount of menstrual blood left in the uterine cavity, the contraction of the uterus caused by intercourse will also lead to bleeding. Second, bleeding caused by cervicitis, such as moderate and severe cervical erosion, cervical intraepithelial neoplasia, and even cervical cancer, can also lead to bleeding during intercourse. Third, endometritis can also cause bleeding at intercourse. Therefore, if bleeding is caused by intercourse between husband and wife, it is recommended that the patient go to the hospital in time for consultation and examination to clarify the cause before treating the problem to avoid delaying the condition.