How much do you know about vaginas?

The vagina looks like a tube, and the tube can elongate and widen.

In 2006, "Grey's Anatomy" creator Shonda Rhimes was told she had used the word "vagina" too much. Rhimes wrote a scene in which "va-jay-jay" was used as a euphemism, and the word took off.

The clitoris, located near the front of the vulva, has almost 8,000 nerve endings. Its sole purpose: sexual pleasure.

The vaginal canal comes to an end when it meets the cervix, which in turn is connected to the uterus. Nothing but sperm can pass through the cervix, so nothing is permanently stuck or lost within the vagina.

Though many people think that an intact hymen is a marker of virginity, the two have very little to do with each other. Some women are born without a hymen, and a completely intact hymen would be a sign of a medical problem. Instead, hymens come in all different shapes and sizes, and by the time of most women's first sexual intercourse, the hymen has stretched or dissolved.

The hymen, if it's present, is located a mere 1 to 2 centimeters (.4 to .8 inches) from the vaginal opening.

The ridges of mucus membranes in the vagina are known as rugae; they protect the vaginal muscles underneath.

The "g" in G-spot is a salute to Dr. Ernest Grafenberg, who wrote about the G-spot in the 1940s and 1950s.

Doctors discourage the practice of douching. The vagina is self-cleaning, and using a douche merely disrupts the natural biological balance of the vagina, which can result in infection.

About 75 percent of women will have a yeast infection at some point. Yeast infections, which are just one type of vaginal infection, include symptoms such as itching, redness and cottage cheese-like discharge.