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File: Flatworm_sex.png (370.95 KB, 650x420)
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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.

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. The "winner" is the organism that inseminates the other; the winner becomes the father. The sperm is absorbed through pores in the skin, causing fertilization in the "loser," who becomes the mother.
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>>100454255
So...it's a Sakura thread?
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>babys first wikipedia

Not anime. Leave.
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That was actually legit interesting.
Thanks anon.
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There needs to to futa doujins about this
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>>100454337
How new are you?
http://exhentai.org/g/471351/192db43bc3/
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>>100454307
>Not anime.
Fuck, I meant to post this to /an/ (animals), not /a/.
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OP, are you in UCI?
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>>100454590
Hey, Fate/Stay Night has a similar thing in a manner of speaking.

So...it's alright.



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