Extramarital relationships vary in terms of the degree of sexual involvement desired and the degree of emotional involvement desired. [1] Variation in the degree of sexual and emotional involvement desired typically reflects variation in the motives for participating in extramarital relationships. These variations provide a basis for distinguishing polyamory and swinging. Polyamory is motivated by a desire to expand love by developing emotionally involved relationships with extramarital partners. Swinging is motivated by a desire for physical gratification by engaging in sexual activities with extramarital partners.