sex drive

Libido in its common usage means sexual desire; however, more technical definitions, such as those found in the work of Carl Jung, are more general, referring to libido as the free creative—or psychic—energy an individual has to put toward personal development or individuation.Sigmund Freud (the father of modern psychology) popularized the term and defined libido as the instinct energy or force, contained in what Freud called the identification, largely the loss of the conciousness component of the psychology. Freud pointed out that these libidinal drives can conflict with the conventions of civilized behavior. It is this need to conform to society and control the libido that leads to tension and disturbance in the individual, prompting the use of ego defenses to dissipate the psychic energy of these unmet and mostly unconscious needs into other forms. Excessive use of ego defenses results in neurosis. A primary goal of psychological analysis is to bring the drives of the identitification into consciousness, allowing them to be met directly and thus reducing the patient's reliance on ego defenses.
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Noun
1. a physiological need for sexual activity; "testosterone is responsible for the male sex drive"
(hypernym) drive

A physiological desire for sexual activity.

Synonyms and related words:
carnality, coldness, flesh, fleshliness, frigidity, impotence, libido, love, lovemaking, marriage, potency, sensuality, sexiness, sexual instinct, sexual urge, sexualism, sexuality, voluptuousness