The onset of vasocongestion results in swelling of the woman's clitoris, labia minora and vagina. Females have a thick, elongated clitoris that protrudes from the labia of the vulva. The onset of vasocongestion results in swelling of the clitoris, labia minora, and vagina. Glands that are located around the clitoris and the labia majoris secrete sebum. The visible portion of the clitoris is the clitoral glans. Clitoral pumping is another applied method of clitoris enlargement. The bulbocavernosus reflex is triggered by stimulation of the glans penis or clitoris. Clitoral erection is a physiological phenomenon where the clitoris becomes enlarged and firm. Local stimulation can involve the clitoris, vagina and other perineal regions. Other possible physiological effects include an enlarged clitoris and shallow vagina. The vulva is deep and has a small clitoris. The glans of the clitoris itself can be pierced. Most women require direct stimulation of the clitoris to orgasm. Parts of the vulva, especially the clitoris, are erogenous zones. The woman can stimulate her own clitoris or her partner's scrotum.