Between Kim KardashianNicki Minaj's "Anaconda" and Jennifer Lopez and Iggy Azalea's "Booty," it's hard to deny that big butts have gone mainstream. They're just so hot right now. But I bet you didn't realize that your back-centric thirst was preordained by evolutionary biology.

According to researchers from Bilkent University in Turkey (you guys are the real MVPs), the reason we're so attracted to serious curves goes all the way back to our hunter-gatherer ancestors. You see, a woman having a back that curves approximately 45 degrees above the top of her butt means she would have had an evolutionary advantage in pre-civilized society. At least that's what science says.

"[The curve] would have enabled ancestral women to shift their center of mass back over their hips during pregnancy, a time during which there is a dramatic forward shift of their center of mass," Dr. David Lewis told The Daily Mail. "Consequently, ancestral women who possessed this degree of lumbar curvature would have been able to forage longer into pregnancy and would have been able to carry out multiple pregnancies with a reduced risk of spinal injury."

So basically, the next time you look at Kim Kardashian's Instagram and say, "Damn! Her ass is nice!" what you're really saying is, "Kim Kardashian would make an efficient gatherer of edible plants."

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