Unsuccessful intercourse lower body bleeding may be caused by the hymen rupture, may also be rough sex or gynecological diseases. 1. Ruptured hymen. If the first time intercourse is not successful, but the lower body has bleeding phenomenon, it is likely to be caused by hymen rupture. First-time coitus due to lack of sexual experience, women’s vagina tight or too nervous, may cause coitus failure, but the hymen is relatively thin and easy to rupture, the penis into the rupture may lead to bleeding, generally less bleeding, accompanied by a sense of pain, can be temporarily observed. 2. Rough sex. If it is not the first time to have intercourse, intercourse did not succeed, but there are bleeding symptoms in the lower body, may be associated with rough sex caused by vaginal mucosa or vulvar mucosa rupture caused by bleeding, often accompanied by vaginal or vulvar pain, bleeding is bright red. Oral amoxicillin or metronidazole can be prescribed to prevent infection. 3. Gynecological diseases. If often unsuccessful coitus lower body bleeding phenomenon should also check whether by acute vaginitis or cervicitis, cervical polyps and other diseases caused by inflammation stimulation of the vagina and cervix mucosal tissue congestion, edema, become fragile, generally easy to break after contact with the bleeding, accompanied by an increase in secretions or odor and other symptoms. The medication can be prescribed by the doctor. There are many possible reasons for unsuccessful sexual intercourse and it is recommended that women seek medical attention to identify the cause of the problem and receive appropriate treatment.