When flatworms mate, two males use their bifurcated penises to fence one another. The winner, or the flatworm who stabs the other other with its penis, remains male while the loser becomes female.
When flatworms mate, two males use their bifurcated penises to fence one another. The winner, or the flatworm who stabs the other other with its penis, remains male while the loser becomes female.
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