sentence: Some women are born without a hymen.
sentences_before: In many women, the opening of the vagina is partly or completely blocked by a thin tissue called the hymen.
sentences_after: The hymen usually breaks when a woman has sexual intercourse for the first time, causing some bleeding. In some cultures, a broken hymen is taken as a sign that a girl has had sex. However, a broken hymen is not a clear sign of sexual intercourse because other activities such as exercise can also cause the hymen to break. In some women, the hymen may remain unbroken even after sex.
concept_name: woman
headings: Sex organ Description Women
categories: Reproductive system