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Penis fencing is a mating behavior engaged in by certain 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.[1]

The flatworms "fence" using two-headed dagger-like penises which are pointed, and white in color. The mating ritual involves a violent battle during which two hermaphroditic flatworms attempt to pierce the skin of one another with one of their penises. One organism will inseminate the other; this flatworm becomes the father. The sperm is absorbed through pores in the skin, causing fertilization in the second, who becomes the mother.[2][3][4] The battle may last up to an hour.[5]
 
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