There are many reasons why there is no bleeding when having intercourse for the first time: First, the hymenal ring is growing at the vaginal opening, so if it is tough, it may not rupture when having intercourse for the first time, and it may only rupture when having intercourse for the second or third time, so observe the amount of bleeding for the second and third time as much as possible; Second, because some women usually have strenuous exercise or hard objects touching the vulva, there will also be bleeding when having intercourse. The hard object touched the vulva, there will also be bleeding, resulting in coitus without bleeding; third, because part of the male genitalia is relatively small, in coitus due to female obesity or vulvar lips are thick, this may also cause coitus failure, will also lead to the first time there is no bleeding, so as much as possible coitus several times, observe the second and third time there is no bleeding.