Libido
Libido, known colloquially as sex drive or a sexual appetite, was one's urge to engage in sexual activities.

Betazoid females went through a phase in the middle of their lives in which their sex drive increased dramatically. Deanna Troi warned William T. Riker about this when they were first dating. ()

Beverly Crusher's female ancestors were known to have strong libidos. ()

According to B'Elanna Torres, Klingon women had "tremendous sexual appetites". ()

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Sex and reproduction
Psychology