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Swingers

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If that's not weird enough, meet the Sea Hares, who evolved as hermaphrodites -- organisms with both sex's reproductive organs in one body. In their world, swinging both ways takes on a whole new meaning.

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High in the frozen Japanese Alps, female snow monkeys engage in same-gender sex. Across the African savannah, "Lion Kings" enjoy intimate male friendships. A pretty seahorse is not just a dad, he's a pregnant dad. And a Mexican whiptail lizard is about to experience a virgin birth. In nature, gender is as flexible as life itself. Meet the World's Weirdest Swingers.

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