Outside of humans and a few other primates , oral sexis a rare phenomenon . But researchers have plant male fruit bat do bask a fiddling oral stimulus , and that the reasons female person offer it go beyond simple pleasure .
Min Tan of China ’s Guangdong Entomological Institute recorded and carefully observed the union habits of 60 fruit bat she captured in the wilderness . To her surprise , she found that , in 70 percent of the sexual encounters , the female squash racket would work out the peter of her mate ’s phallus . This makes yield bats the only known coinage besides human race to engage in regular fellation .
So why are these at-bat so batty for fellatio ? Tan has a few theory . For one thing , sexual encounters that demand oral stimulus last , on ordinary , 100 seconds longer than those that did n’t , something that could be conducive to fertilization . Or the distaff cricket bat could be occupying her mate for as long as possible so that a rival female does n’t snatch him aside . The reason could also be hygenic , as male bats cream their own penises after gender to clear away bacterium and fungus . Or , she could be expect for chemicals that bespeak whether the male is a suitable teammate , so that she be intimate whether to freeze off his sperm or expect for a better better half next time around .
As an example , the researcher kindly provide a rather NSFW video that illustrate their findings , complete with phrenetic mood music :
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