The most common reasons for bleeding during intercourse after menstruation are as follows: 1. bleeding caused by damage to the vaginal mucosa due to rough sex action. 2. local lesions of the cervix, such as cervical polyps, chronic cervical inflammation or early cervical cancer, can lead to contact bleeding. 3. as the menstruation is just clean, it looks clean from the outside, and there is still residual menstrual blood in the uterine cavity, after intercourse in After intercourse, under the action of external force, these menstrual blood will be discharged from the uterine cavity again, which will lead to bleeding after intercourse. Therefore, if you find bleeding after intercourse, it is recommended to have ultrasound examination, routine white belt test, and cervical cancer screening.