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16 Batshit But Actually True Animal Sex Facts

Snakes have two penises, and alternate which one they use when mating.

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1. Male anglerfish fuse irreversibly with female anglerfish during sex.

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In order to reproduce, the "sexually parasitic male" attaches itself to the female's belly. Their circulatory systems then connect, and the male slowly dissolves. You can see a picture here.

3. Male rhesus macaque monkeys will "pay per view" to see the bottoms of the female rhesus macaque monkeys.

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A study showed that "male rhesus macaques sacrificed fluid for the opportunity to view female perinea and the faces of high-status monkeys but required fluid overpayment to view the faces of low-status monkeys."

4. Anacondas breed by forming "breeding balls" – multiple males wrap around a female and attempt to mate.

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On Audible's Zoopedia, Sue Perkins explains: "This process lasts for up to a month. Females can be several times the size of their mates. This means that larger male snakes are occasionally mistaken for females and find a knot of snakes forming around them."

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9. The antechinus is a tiny Australian mammal that has sex for up to three weeks solid, then disintegrates.

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This type of activity is called semelparity – which means sex happens once in a lifetime. National Geographic writes: "This burst of speed-mating is his one chance to pass his genes on to the next generation, and he will die trying. He exhausts himself so thoroughly that his body starts to fall apart.

His blood courses with testosterone and stress hormones. His fur falls off. He bleeds internally. His immune system fails to fight off incoming infections, and he becomes riddled with gangrene."

12. The male capuchin monkey covers himself in urine to show that he's keen to mate.

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On Audible's Zoopedia, Sue Perkins explains: "Unlike with some primate species, it’s not visually obvious when the female capuchin is ready to mate – so she has to take the initiative herself. This usually involves getting the attention of a male by shaking branches and throwing stones at him while pouting."

"The male communicates his social and sexual status to the females by [washing] himself in urine. The exact reason for this behaviour is still disputed but it’s probably part of some sort of chemical or pheromone signalling."

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13. Female Chinese fruit bats turn themselves upside down to fellate the male bat while having sex.

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Researchers believe it could help with fertilization. "Sexual encounters that involved oral stimulation lasted, on average, 100 seconds longer than those that didn't, something that could be conducive to fertilization."

16. And alligators seduce mates by bellowing from the water.

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On Audible's Zoopedia, Sue Perkins explains: "Their mating season tends to be in the spring, when they gather in large numbers and bellow together – causing infrasonic waves that make the water around them to ‘sprinkle’ – these are called ‘alligator dances’ – which is a surprisingly sweet name for what is essentially a gathering of horny killers."

"The courtship itself can take up to a month, with the male seducing a specific female with purring vocalisations called ‘chumpfs’ and by lifting his head out of the water."