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a sexual instinct or desire; the expression of one's instinctual energy or drive, especially the sex drive.
anal erotism in psychoanalytic theory, fixation of libido at (or regression to) the anal phase of infantile development, producing egotistic, dogmatic, stubborn, miserly character.
genital erotism in psychoanalytic theory, achievement and maintenance of libido at the genital phase of psychosexual development, permitting acceptance of normal adult relationships and responsibilities.
oral erotism in psychoanalytic theory, fixation of libido at (or regression to) the oral phase of infantile development, producing passive, insecure, sensitive character.
pleasurable experience centered around defecation and related activities associated with the anal zone, especially during the anal phase in children 1-3 years old.