Ducks have corkscrew penises. The Oxyura vitatta, or Argentine Blue Billed Duck has the longest penis of all vertebrate in relation to body length. (42.5 cm!)
Sharks have two penises. They are called claspers, and are technically part of their dorsal fins.
Blue Whale penises are between 2,4-3 metres long. One specimen may have been up to 5 metres long.
Male argonaut octupi convert one of their arms into a hectocotylus, which detaches during copulation and stays in the female. The male then dies.
At first scientists thought this hectocotylus was a parasite when they found it in the females, and the male wasn't discovered until the 19th century.
Hectocotylus was the name they gave to this "parasitic worm".
Many snail species have a so called "love dart" (which is not an actual penis) that they shoot at their partner before copulation. If hit the "victim" is more likely to produce more eggs. (Snails are hermaphrodites). So the better jouster has to expend less energy to produce eggs.
Please don't google pictures of slugs mating.
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