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Why Sea Slugs Dispose of Their Own Penises ... a new study finds that the ostentatious sea slug, or nudibranch, may take the cake—one species of this marine invertebrate cuts its own penis off after mating and regrows a new reproductive organ within 24 hours, whereupon it’s ready to mate again. Most nudibranchs are simultaneous hermaphrodites, meaning individuals have both male and female reprod…