The hymen is the piece of skin sometimes covering a female human's vagina. It varies considerably in shape and elasticity, but is generally either stretched or torn during the first attempt at sexual intercourse. A virgin is someone who has never had sex. Contrary to popular belief, an intact hymen is not a conclusive proof of a woman's virginity.

1. NOT EVERY VIRGIN HAS A HYMEN.
Some babies are born without a hymen. They were not deflowered from the womb, were they? Of course not.
2. MOST HYMENS HAVE ONE OR MORE OPENINGS, TO ALLOW THE OUTFLOW OF MENSTRUAL BLOOD AND VAGINAL DISCHARGE. A hymen without any opening (i.e. an imperforate hymen) needs to be perforated to allow menstrual flow. The various types of hymen are depicted in the picture attached to this article.
3. NOT EVERYONE WITH AN INTACT HYMEN IS A VIRGIN. As stated earlier, a hymen is either stretched or torn during the first attempt at sexual intercourse. A woman in her teens or 20s usually has an inelastic hymen that breaks easily and bleeds at penetration. Even then, new tissue grows to fill up the hymen within 6-12 months of abstinence from sex or any other penetrative activity, making her pass for a virgin again. (a) If you are a woman who has just been used and dumped, abstain from sex for the next 6 months, keeping any new suitor as a platonic friend. Then squat, part your inner labia and check your vaginal opening with a mirror. There is no harm in experimenting with abstinence. (Virgins should not experiment with sex or married women starve their husbands sexually in order to carry out this experiment). (b) If you are a man, staying away from your wife for 6-12 months and then checking her vaginal opening can confirm her fidelity or otherwise ONLY IF her hymen is the inelastic type. An elastic hymen will always bounce back into place after sex and fool you.
The hymen of a woman in her 30s usually becomes very elastic, due to exposure to higher amounts of estrogen. It (whether "follow-come" or regrown) usually stretches (sometimes all the way to the cervix) without breaking during sex and bounces back to the vaginal entrance afterwards. It can allow deep penetration and let semen flow into the womb for pregnancy to occur. Unless she or her lover learns to stretch her hymen with her fingers (by pushing in the finger and letting it stay there for a few minutes before slowly removing it and going to another spot on the hymen) regularly before sex, penile penetration will be more difficult for her each time she has sex than for a younger lady (whose hymen will quickly break and stay that way unless she goes on a long sex fast) because the typical guy will thrust in fast.
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So there you are. Only a woman knows for sure whether she is still a virgin or not. Don't ask her unless you are ready to believe whatever she chooses to tell you. Her current moral values and her health status (HIV status, genotype, blood group,etc) matter more than her virginity (which can be lost through rape). If you are about to marry a woman you haven't slept with, take her for a pregnancy test to prevent paternity fraud.

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