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. (TNG: "Manhunt")
Beverly Crusher's female ancestors were known to have strong libidos. (TNG: "Sub Rosa")
According to B'Elanna Torres, Klingon women had "tremendous sexual appetites". (VOY: "Faces")