Lubrication
Any substance that reduces friction between two or more colliding object in motion is termed as lubricant, the action of reducing friction is termed as lubrication. In human body, when two person engage in sexual intercourse, lubrication is required to facilitate the intercourse and reduce the painful friction between the vaginal walls and the penis. Fluid that is secreted from the cervix and also the secretions from the Bartholin glands, which are two pea sized glands at the base of the vagina are solely responsible for keeping the vagina lubricated, besides the hormonal influences. During the period of arousal, the Bartholin glands secrete necessary fluid for reducing the friction. Occasional vaginal dryness is commonly observed, but when it is common, it can be either a symptom of menopause or a medical issue, like vaginal atrophy. People who have daily complaint of vaginal dryness should consult with a healthcare professional.