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 this Mexican whiptail lizard is about to experience a virgin birth. In nature, there's no such thing as "straight" or "gay". Gender is as flexible as life itself. Meet the world's weirdest Swingers. Episode 3 of 3 season 1.