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At least for humans, this most basic of acts is anything but basic. As the pioneering sex researcher Alfred Kinsey put it, the only universal in human sexuality is variability itself. Within the universe of intimacy and pleasure that sex affords, however, there's a lot of room for error.
People normally differ in the degree of sexual appetite they have. There is no single standard of sexual desire, and desire differs not only from person to person but also in the same person over one's lifespan.