The reason why girls don’t bleed the first time they have sex is mainly because the hymen is thick and elastic, or the hymen has old damage. The first time sex, the vast majority of girls will appear bleeding phenomenon, mainly because of the hymen damage caused by the rupture of capillaries, the general bleeding is small, it is recommended to maintain local cleanliness in daily life to reduce the possibility of infection. 1, hymen texture thick, good elasticity: some girls congenital hymen thick, good stretch, hymen hole is relatively large, line life will not damage the hymen, and even The hymen remains intact after childbirth, so it does not bleed. Girls hymen have many kinds of shapes, can be sieve-shaped, half-moon, the vast majority is round, the size of the hymen hole also varies; 2, the hymen has old damage: may be the past strenuous exercise or trauma history, resulting in hymen damage, so the first sex often does not make the hymen re-injury, and the phenomenon of bleeding, as long as the careful questioning of medical history, to understand whether the previous in strenuous exercise or history of trauma with a little vaginal bleeding, it is possible to understand if there was ever a laceration.