A Compendium Of Masturbating Animals

“Elephants have been known to rub up against rocks for pleasure. However, to collect semen from captive elephants for artificial insemination, zookeepers must manually stimulate a bull’s rectum to massage its prostate (yep, that means some poor zoo worker has to don a glove and reach up there). Fun fact: Elephant penises are curved like an S, and can reach 3–5 feet (1 to 1.5 meters) in length with a 6-inch (16-centimeters) girth. Meanwhile, elephant clitorises can reach more than a foot long (40 cm)!”
 — Don’t deny it, you want to see a slideshow on why animals masturbate and you want to see it now. Thanks, Livescience!