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Though customs may differ around the world, almost every society shares one thing -- the concept of gender. Yet some societies recognize more than 2 genders. NGC takes you to India, where hijras -- or transvestites -- marry their god in a festive ritual. Then travel to an Indonesian village that recognizes five genders and worships hermaphrodite priests. Finally, head to rural Albania, where female "sworn virgins" take an oath to live and act as men in a practice that is more than 500 years old.