When riding horses and other strenuous activities or have been traumatized, may cause the hymen to rupture. The other situation is that the woman’s hymen is so elastic that the hymen does not rupture during the first intercourse, so there is no bleeding. In addition, there are also with the growth of age or congenital factors, the hymen blood vessels less, this situation also will not have the first intercourse bleeding; 2, less bleeding after the first intercourse: in general, after the first intercourse bleeding less and will not continue to bleed, generally manifested as only a few drops of blood or after intercourse appear brown discharge. This kind of bleeding is mostly caused by the rupture of the hymen after the first intercourse, which is a normal phenomenon, do not worry too much; 3, bleeding after the first intercourse is larger: may be due to the first intercourse after the female vaginal tear, in this case the bleeding is larger and may be accompanied by pain, bleeding is larger than the amount of menstruation and last longer, it is recommended to seek medical examination and timely treatment.