Thanks to recent research by the Fruit & Vegetable Improvement Center (a part of the Texas A&M University Department of Horticultural Sciences), watermelon is now known as nature's Viagra. A phytonutrient found in the fruit called citrulline has the power to relax blood vessels in a manner similar to prescription erectile dysfunction medication. For this reason, watermelon is also referred to as the man's aphrodisiac. The citrulline in watermelon is found in highest concentration in the white part of the flesh, so anyone looking for a little boost might want to develop a taste for pickled watermelon rind. As an added bonus to the male sexual system, watermelon is one of the world's finest sources of lycopene. While lycopene is best known for supporting heart health, it is also beneficial to the functioning of the prostate. Although talk of men's health may not conjure up visions of romance, the juicy, pink flesh of watermelon speaks for itself in the sensuality department. Hand-feed your lover morsels of sweet watermelon and let science do its work while you savor the moment.