Final answer:
Vaginal lubrication is facilitated by the Bartholin's glands, which secrete mucus during sexual arousal to reduce friction and enable comfortable intercourse.
Step-by-step explanation:
Vaginal lubrication occurs through the secretion of fluids from the Bartholin's glands, which are located near the vaginal opening. These glands lubricate the vulva and are part of the body's natural lubrication system, similar to how saliva aids in the swallowing process and mucus reduces friction between internal organs. During sexual arousal, the Bartholin's glands secrete mucus to facilitate intercourse by reducing friction and making penetration more comfortable.