As a woman walks, stands or sits, the inner lips of the clitoris are pressed against each other, making the clitoral opening to the vagina about an inch or so receded from the outside. When the legs are open, as in an examination, the lips part and their sides form the walls of a valley; gynecologists have dubbed this valley the “vestibule”, meaning the outer chamber. Actually, this indentation only exists in this position. During sexual excitement, the lips and the underlying clitoral bulbs swell, making the clitoral opening of the vagina seem even more recessed.