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1. Male Alligators Have Permanent Erections 2. Female Kangaroos Have Three Vaginas 3. Antechinus Males Copulate Themselves to Death 4. Flatworms Fence With Their Sex Organs 5. Male Porcupines Urinate on Females Before Sex 6. Barnacles Have Enormous Penises 7. Mating Snails Stab Each Other With 'Love Darts' 8. Female Chickens Can Eject Unwant......