Bleeding after intercourse is bright red, which suggests that there may be many causes. For example, if the cervix is irritated during intercourse, including the blood vessels of the vaginal wall, bleeding may occur. When intercourse is performed with excessive force, the posterior fornix may rupture and the bleeding may be bright red and heavy. It is recommended to go to the hospital for a gynecological examination to rule out any rupture of the vaginal wall, including the posterior fornix, and according to the situation, suturing is needed to avoid bleeding that may affect your health. For example, if the cervix is stimulated during intercourse and there is cervical erosion at this time, stimulation of the erosion surface will cause bleeding. You can observe the situation for three days, and if it gets more and more during these three days, then go to the hospital in time to see if the bleeding is from the erosion surface, and depending on the situation, compression with gauze is needed to stop the bleeding.