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What Is a Love Dart?
A love dart is a structure used by at least nine families of land snails to make sure that their partner's body won't break down the sperm. Some species will shoot only one love dart, others it's a bit more repetitive. One species use the same dart to poke their mate over and over again for about an hour. The act goes both ways with the punctured snail turning the tables and puncturing its mate with its own love dart so that they could eventually pass sperm packets to each other and mate.