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desire that has yet to be acted on. Physical manifestations of sexual desire in humans include licking, sucking, tongue protrusion, and puckering and touching the lips.

Desire can be spontaneous or responsive, positive or negative, and can vary in intensity along a spectrum.

Theoretical perspectives

Theorists and researchers employ two frameworks in their understanding of human sexual desire. The first is a biological framework, also known as sex drive (or libido), in which sexual

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