AnimalsWeirdMale iguanas have two penises, called hemipenes, which they use one at a time during mating.761k
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AnimalsWeirdBanana slugs can grow up to 10 inches long, and their penises—which emerge from their heads—can be equally impressive. After mating, one slug sometimes gnaws off its partner's penis in a bizarre process called apophallation.233k
ScienceMind-BlowingKissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.132k
AnimalsWeirdWhen a drone bee mates with a queen, its ejaculation is so powerful that it can even be heard by the human ear.61k