Apologies if this has been done before

  • Jorgelino@lemmy.ml
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    9 months ago

    Some species of flatworm practice what is known as “penis fencing” to reproduce. All of them are hermafrodite and in order to mate they must duel with their sharp penises and try to stab eachother to inject sperm inside, impregnating the loser, but often also killing it.