Below is a three dimensional flythrough illustration of a clitoris. (It may take a few seconds to load). You can zoom in and out and spin the image around to view from any angle. The clitoris is made from the same kind of erectile tissue as the glans of the penis. It is rich with sensitive nerve endings, especially at the exposed tip. As far as we are aware it is the only human organ that exists solely for the purpose of pleasure.
Amazingly the full extent of this vital part of the female anatomy was only properly disclosed in 2005.