If bleeding occurs after sex, the following conditions should be considered: 1. Cervical lesions, such as cervical erosion, cervical polyps, and malignant lesions of the cervix, may lead to this condition; and vaginal bleeding after intercourse is often a sign of malignant cervical lesions and should be taken seriously. 2. 3. If bleeding occurs after intercourse when you are about to have your period, it may be related to menstruation. Vaginal bleeding after intercourse should be taken seriously and cervical cancer screening should be done.