http://discovermagazine.com/galleries/zen-photo/_num/8-clever-ways-female-animals-control-reproduction

let's discuss it!

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Unlike most birds, male ducks have penises. And not just your garden-variety penises: corkscrew-shaped phalluses that are over a foot long and capable of "explosive eversion" They often use these large penises to forcibly mate with unwilling females.

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Duck biology indicates that they don't take \"No\" well, apparently.

"female ducks have exceedingly complicated vaginas to keep unwanted phalluses out. And while the males penises spiral counterclockwise, the females' vaginas wind clockwise, making it harder for the males to get in a significant distance. What's more, female ducks have anatomical blind alleys in their vaginas: Unwanted males that can't get very far in end up ejaculating into shallow pouches that keep sperm far away from any eggs. A willing female, on the other hand, can relax her muscles to let the male further in, increasing the chances of conception."

Crazy. but even better:

"Female ducks are doing something right: While a third of duck sex is the forced kind, only 3% of all offspring are born out of these matings."

This implies some pretty politically incorrect things. a third of these male ducks are (by human social standards) unwanted sexual predators. and females have evolved to block their attempts to mate. And males have evolved to rape.

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i'll just let this paragraph on page 5 speak for itself:

"Moreover, by mating with multiple males, some researchers have argued, paternity becomes confused. That may not sound obviously desirable, but it decreases infanticide by males: Male primates are less likely kill young they did not father if they can't tell which babies are theirs."

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Problem?

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And if you thought the duck thing was bad and rapey, how's this one for evolutionary 'rape culture':
"Female bed bugs have perfectly intact and straightforward reproductive tracts, but male bedbugs aren't into that. No, they opt instead for traumatic insemination, which is just as grisly as it sounds."

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Rip and Tear! Because what is more alpha than that?

for a pop sci article that was really quite good I thought.