Greater vestibular glands, also known as Bartholin’s glands, are two exocrine glands that lie under cover of the posterior parts of the bulb of vestibule and the labia majora. These glands are homologous to the male bulbourethral glands. They secrete mucus to lubricate the vagina during sexual intercourse. The important difference between the greater vestibular glands of females and the bulbourethral glands of males is that the former are located in the superficial perineal pouch and the later in the deep perineal pouch.
As stated above, the greater vestibular glands secrete mucus to provide vaginal lubrication during sexual intercourse. The secretion is minute in quantity and is not the major factor in vaginal lubrication. Most of the lubricating substance comes from deep within vagina.