When a woman has sex for the first time, she may experience pain due to the rupture of the hymen and bleeding, and the pain may be exacerbated if the woman’s own vagina is too narrow. When a woman has sex for the first time, the hymen ruptures, which may cause pain, and the bleeding that often accompanies the rupture of the hymen may also cause pain. If a woman’s vagina is too narrow, the pain may be more pronounced. Since a woman’s hymen is in a tight state when there is no external stimulation, when subjected to external stimulation, it can lead to localized hymen rupture, inducing pain and bleeding. If it is too violent during the first sex, it may even lead to the tearing of the hymen, causing even more serious pain. If a woman has severe pain and heavy bleeding during her first sexual intercourse, she needs to go to the hospital in time.