Bats are amongst the most common forms of mammal on the planet but because of their habits not much is known about them in comparison to other kinds of animals.  One of the thigns that was learned recently by biologists is that bats give oral sex.  That's right.  Bat girls treat their men right (and are flexible enough to lick without needing the guy to pull out so ladies get to work on that contortionist exercise!) it was observed that for every second of oral sex provided regular sex was extended by about six seconds.  (I'd love to see the math done on humans).  Scientists are currently trying to figure out what the evolutionary advantage of this act is though the current idea is that it gives the female bat longer to get her bat parts up and running to increase the chances of sucessful inpregnation.  So basically it's the bat version of Not Yet.