There are obviously some similarities between the courtship and mating rituals of animals and our own both involve display, preening, selection based on attributes, possessiveness, and a certain amount of crafty behaviour. By discarding the penis, they are making sure that their sperm will not be contaminated by that of their rival during their next sexual encounter.īiologists discovered that 24 hours or more after the sea slug’s penis has been cast-off following mating, a tightly coiled spiral structure inside the animal uncoils to become the replacement penis. Not only are nudibranchs hermaphrodite, but they also discard their penises 20 minutes after sex – and a new one appears virtually the next day! Scientists believe this is a way for the molluscs to remove rival sperm from a mate’s vagina, as sea slug penises have tiny spines which are often coated with sperm after mating. not the most attractive of creatures but what a sex life! Sex is a two-way street for these molluscs as both partners have a penis and vagina, both of which are used in mating. Brace yourself for the nudibranch, or sea slug….
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