Lips are a visible organ, at the mouth of humans and many animals. Lips are soft, protruding, movable, and serve as the opening for food intake, as an erogenous organ used in kissing and other acts of intimacy, as a tactile sensory organ, and in the articulation of speech. Anatomical basics of the human lip One differentiates between the Upper (Labium superius) and lower lip (Labium inferius). The lower lip is usually somewhat larger. The border between the lips and the surrounding skin is refe… (More on Lip)