What is the average vagina size?

The perception of the vaginal canal as being the primary source of orgasmic stimulation may be exaggerated in many cultural circles. The most sensitive area of the vagina is the section closest to the outside of a woman's body, which is roughly 10 centimeters (4 inches) in length. Given that the average penis size is above this length, most men should be able to easily reach and stimulate these erotic nerve endings.