One situation is that the old menstrual blood remains in the vagina and comes out after intercourse, which does not have any effect on the body. Another situation is the existence of cervical lesions, contact bleeding will occur after intercourse, such as the existence of cervical polyps or cervical erosion, cervical lesions can make the local cervical texture becomes bad and brittle, so easy to bleed after contact. In this case, you need to go to the hospital in time to have a gynecological examination to observe whether there are polyps, erosion and hypertrophy on the surface of the cervix, and you can also have a cervical TCT test, which is a screening test for cervical cancer. If you are sure that the bleeding after intercourse is caused by cervical lesions, you must carry out the next treatment under the guidance of a professional doctor.