The vast majority of women experience vaginal bleeding the first time they have sex, mainly due to hymenal laceration. Individually, vaginal bleeding does not occur even the first time they have sex, mainly due to the following reasons. The first one is caused by trauma or strenuous exercise in the past. This is often the case because the hymen is relatively thin and more likely to crack. The second is that when you are young and don’t know any better, you may unintentionally injure your hymen. The third, after being raped, the hymen is cracked and there will be no vaginal bleeding during intercourse. The fourth, due to the development of the hymen itself, the congenital development of the hymen mold hole is relatively large, the hymen wall is relatively thick, the penis in and out of the hymen will not cause damage to the hymen, will only cause local pain, so there will be no bleeding situation.