The hymen serves 3 main purposes: first, it is an iconic structure of the female vagina. The hymen is located at the outer entrance of a woman’s vagina. When doing an examination, find the hymen and find the location of the woman’s vagina; secondly, the hymen is a representation of whether the patient has had sex or not. Also, after a sexual assault, by examining the hymen, you can determine whether the sexual assault was successful or not, so it is very important to perform a hymen examination among sexual crimes. However, for women who have already had sex, hymen examination is not very meaningful; thirdly, the hymen has a protective role. The female hymen is located at the outer entrance of the vagina and can block some bacteria, viruses and microbial infections, so it has a protective effect on the female vagina.