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Corkscrew genitalia Sexy nackte ahsoka tano star wars everyone! And penis spines. There are always penis spines. Male muscovy ducks, for example, have corkscrew-shaped penises that spring out from Duck don xxx images body in less than half a second and are 20cm long when erect.

Other species' length varies from 1. They twist in the opposite direction to the male duck's penis. But, crucially, they Duck don xxx images dead ends they can try Duck don xxx images send the males down if they don't want to have their ducklings.

So females seem to have evolved vaginas that make it hard for a male duck to actually inseminate them, if they don't want it to, by forcing it towards the dead ends. Of course, the male ducks haven't taken this lying down.

The more forced copulation a duck engages in, the longer the males' penises tend to be, according to a study in Proceedings of the Royal Society B. In fact, male ducks grow a new penis every year yes, you read that right. Which means they can vary the length depending on that year's competition. When a female does want to mate with a male, she will contract and relax internal muscles that scientists think help make sex easier. Posted on August 22,GMT.

Kelly Oakes. BuzzFeed Staff, UK. Some ducks also have barbs on their penises to scrub away competing sperm.


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