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Cock Fencing

Species which engage in the practice are hermaphroditic ; each individual has both egg-producing ovaries and sperm-producing testes. The flatworms " fence " using extendable two-headed dagger -like stylets. These stylets are pointed and in some species hooked in order to pierce their mate's epidermis and inject sperm into the haemocoel in an act known as intradermal hypodermic insemination, or traumatic insemination. Pairs can either compete, with only one individual transferring sperm to the other, or the pair can transfer sperm bilaterally. Both forms of sperm transfer can occur in the same species, depending on various factors.

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