Vaginal Lubrication: Vaginal Dryness, Vaginal Health, and More Vaginal_lubrication A frontal cross section illustration of the vagina showing the action of a vaginal lubricant which lubricates the entrance to the vagina and hydrates SuperStock VAGINA The vagina serves as the inferior region of the birth canal. It also serves as the passage way for the sloughed endometrium that results from menstruation and is the receptacle for Why you should use a vaginal moisturizer during your period