Most people will have a virginity complex, judging whether a woman is a virgin all based on the first intercourse whether there is bleeding phenomenon. If there is no bleeding on the first night, it is assumed that the woman is not a virgin, serious and even affect the relationship between the couple. The first night alone to see whether the bleeding, to determine whether the woman is the first night, is a very unscientific approach. The first intercourse does not necessarily bleed, appearing bleeding is only part of the people. There are more reasons for not bleeding, the thickness of the hymen varies from person to person, usually one to two millimeters, and its brittleness varies. If the hymen is thick, tough, elastic, has a large hymenal hole, contains few blood vessels, is congenitally absent, or is lacerated during strenuous exercise, it may result in no bleeding during the first intercourse. And in a few women, the hymen can be close to the edge of the vaginal wall and it can not rupture at all during intercourse. The amount or absence of bleeding during first intercourse is determined by the distribution of blood vessels in the hymen, the depth of the fracture, and a combination of other factors. When there are fewer blood vessels in the hymen and the fracture is shallow during intercourse, it is also possible that there will be no bleeding. Understanding the reasons why a ruptured hymen does not necessarily bleed during the first intercourse, I am sure you will not be stubborn and affect the couple’s relationship.