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Love is one of the most profound emotions known to human beings. There are many kinds of love, but most people seek its expression in a romantic relationship with a compatible partner. For many, romantic relationships comprise the most meaningful aspect of life, providing a source of deep fulfillment.
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. From attraction to action, sexual behavior takes many forms.