Vaginal Canal
Medical visualization of the lumen of the vaginal canal looking back
towards the cervix. Far from being a smooth tube, the vagina contains
many folds and ridges. During sexual intercourse the sperm that may be
deposited within the vaginal canal will benefit from the pH buffering
makeup of semen because the vaginal environment is acidic. The vagina
also produces lubrication to make penetration less difficult during
intercourse. The vaginal opening, seen in this view in the extreme
foreground, tightens involuntarily as intercourse progresses.

Overweight Woman with Visible Internal Anatomy Walking Outdoor