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.
So...it's a Sakura thread?
>babys first wikipedia
Not anime. Leave.
That was actually legit interesting.
There needs to to futa doujins about this
How new are you?
Fuck, I meant to post this to /an/ (animals), not /a/.
OP, are you in UCI?
Hey, Fate/Stay Night has a similar thing in a manner of speaking.