Sometimes you come across things on the internet and you're like, how did this not result in an intergalactic media extravaganza, the likes of which a leaked Michael Jackson-Sarah Palin sex tape could only hope to muster, ... or at least land a Time magazine cover story or something:
Female ducks have evolved "maze-like" genitals with many twists, pouches and dead ends, in a bid to prevent rape and retain control of who fathers their offspring – while male ducks have evolved equally convoluted penises to keep up.
You win everything, ducks. Congratulations.
Duck genitals locked in arms race [Cosmos]