The first coitus did not appear to bleed, but feel a lot of pain, there are several possibilities: 1, in the past because of trauma or carelessness, such as strenuous exercise, caused by the hymen has been cracked. So in the time of coitus there will be no more hymen crack, there will be no bleeding, but feel there will be pain. 2, due to the hymen hole is relatively large, and the hymen is relatively thick. When the penis enters, the hymen hole is not cracked in the case of the penis can also pass smoothly, this situation will not cause hymen crack. So in the clinic, although it is the first time sex will not appear bleeding phenomenon, in the future to give birth to a child in the process of vaginal delivery can also lead to hymen cracks.