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These rounds of rubbing may have a purpose — one study of the behavior suggested that pulling off the top layer of hemipenis skin may help remove any bacteria and parasites the male picked up during copulation, or keep the intricate skin frills on the surface of the hemipenes well groomed.

We get the urge because our ancestors did too, even back to the earliest mammals and reptiles.

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During the breeding season, both male and female porcupines rub sticks against their genitals.

Females from at least 50 species also get into the act, and they can get creative: for example, female orangutans and capuchin monkeys have both been observed using sticks and other plant parts as makeshift dildos.

But large males are territorial, and ruthless about shoving small males off of females mid-copulation long before they ejaculate.

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Murray Levick in 1911 during the Scott Antarctic expedition: Sometimes we saw these birds, after walking some distance, apparently in the vain search for hens, stand motionless and rigid upon the ground, then stiffening themselves, assume the attitude and go through the motions characteristic of the sexual act, in some cases actually ejecting their semen on to the ground.

0; Marine iguana by Lieutenant Elizabeth Crapo, NOAA Corps via Flickr CC BY 2.