Penis fencing

Rarity: Common

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Science and technology

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What Wikipedia says

Penis fencing is a mating behavior engaged in by many species of flatworm, such as Pseudobiceros hancockanus. Species which engage in the practice are hermaphroditic; each individual has both egg-producing ovaries and sperm-producing testes.

Excerpt from the Wikipedia article “Penis fencing”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Photo courtesy of Nico Michiels., CC BY 2.5, via Wikimedia Commons.