There are many reasons for vaginal bleeding during intercourse: 1. Most women who have intercourse for the first time are prone to vaginal bleeding due to hymen rupture, accompanied by strong pain, which is a normal physiological phenomenon and can heal on its own in three to four days. 2. If you have vaginal bleeding during intercourse, you may have cervical erosion or cervical polyps, so you need to go to the gynecology department of the hospital and cooperate with the doctor for gynecological examination to confirm the diagnosis. 3. If vaginal bleeding occurs after intercourse, you should be alert to the possibility of cervical cancer and other diseases.