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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 Unwanted Sperm

9. Male Honeybees Lose Their Penises While Mating

10. Sheep Have a High Rate of Homosexuality

11. Male Anglerfish Merge With Females During Mating

12. Male Damselflies Can Remove the Sperm of Competitors