Most girls will have vaginal bleeding when they have sex for the first time. This is mainly caused by hymenal laceration, the amount is relatively small and is normal. However, if it is the first time you have sex and the vaginal bleeding is relatively more than the amount of menstruation, it is an abnormal phenomenon. It is recommended to go to the hospital as soon as possible for examination, as it is likely to be caused by vaginal mucosal damage, and if necessary, sutures are needed to stop the bleeding. If necessary, sutures are needed to stop the bleeding. After the sutures are closed, sexual intercourse is not allowed before the stitches are removed to avoid local infection or re-injury. It is recommended to be gentle during sexual intercourse and both men and women should wash their genitals before sex to keep them clean and avoid pathogenic infections.