We humans have made genitals such a convoluted and taboo topic, that even a mention of them will evoke at least one red face in every crowd. But animals have taken them in a different direction -- some way farther than others. While size may not matter to them, barbs, explosions, and hypodermic needles just might. 10. The Sea Slug's Hypodermic Penis https://www.youtube.com/watch?v=vc11EsvkSLI The brightly colored sea slug Siphopteron quadrispinosum carries a penis that functions roughly in the same manner as a hypodermic needle. The appendage, outfitted with several large hooks at its base and spines on the tip, is designed to