Hymen is a membrane covering the outermost part of the vagina with some tiny holes allowing the monthly menstruating blood to come out.
Types of hymen:
It has no physiological roles. However it is important for medicolegal purposes:
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Imperforate hymen : no holes to allow menstruating blood to come out. So the girl is at the age of puberty but without menstruation (which is false – she is menstruating but the blood do not get out of her uterus, accumulation over time causes her abdomen to swell). She might be falsely accused of being pregnant.
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Parous introitus means the female have had a sexual intercourse and has delivered a baby. This is important in case of rape especially that of a virgin. Another example is when a woman get married then her husband found out she is not virgin anymore (yeah, she lied about being a virgin).
