The first time sex is possible to bleed, the specific amount of bleeding varies from person to person, women who have not had sex, most of them exist hymen, the first time sex, because of the expansion of the women’s vaginal wall and the tearing of the hymen, it is easy to bleed, the specific amount of bleeding, according to the thickness of each person’s hymen, and the degree of tearing of the first sex to decide. For women with a thicker hymen, it is easier to form a larger wound during the tearing process and the bleeding will be greater. For women with a thinner hymen, the degree of hymen tearing is relatively less likely to form a larger wound and thus the bleeding is relatively less. There are also about 20% of women who, for congenital developmental reasons, or early strenuous exercise, such as bicycling, can cause the hymen to have torn and may not bleed, but the first bleeding will not be large and may recover within 24 hours.