The vulva is the external female genitalia. It includes the "lips" or folds of skin (labia), clitoris, and the openings to the urethra and vagina.
Katz VL. Reproductive anatomy: Gross and microscopic, clinical correlations. In: Katz VL, Lentz GM, Lobo RA, Gershenson DM, eds. Comprehensive Gynecology. 5th ed. Philadelphia, Pa: Mosby Elsevier; 2007:chap 3.