In most cases, vaginal bleeding occurs after a woman’s first intercourse. This is mainly because a woman’s first intercourse will make the hymen rupture, the hymen is located in the outer mouth of the vagina, the penis into the female vagina will cause the hymen rupture, hymen rupture will be localized blood vessel rupture bleeding, so there will be bleeding. However, the amount of bleeding is usually very small and can be cleared within 1-2 days, so no special treatment is needed. Another part of women, about 30%-40% of women, do not bleed when they have intercourse for the first time. This is mainly because a woman’s hymen can rupture without sexual intercourse, such as when the patient engages in strenuous physical activity, or suffers from trauma or impact, etc. In addition, if a woman’s hymen is very elastic, it will not bleed during intercourse. In addition, if a woman’s hymen is very elastic and thick, successful coitus can also not cause hymen rupture, which is also seen in the clinic, so the patient in the first coitus can not appear bleeding.