It's all about the curve of yo' spine, baby.
You already know that some men love a big butt, but it looks like science is breaking down the infatuation might have more to do with the curve of a woman's spine.
A study at Bilkent University showed 300 women different silhouettes of women with different degrees of curvature in their spines. They then rated which they found most attractive.
In the end, majority of men were attracted to a woman who has a spine with a curve of 45.5 degrees. You may think this is a weird thing for men to notice - and it is, more on that later - but the attraction is actually tied into a woman's fertility: women with curvier spines are more fertile.
"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," explained Dr. David Lewis, a psychologist at Bilkent University to Daily Mail.
So does the attraction of the curve of her backside have anything to do with the size of her butt? Possibly.
Dr. Lewis believes that men who talk a lot about loving "big butts" might actually be more into the curve of a woman's spine, but are misdirecting their compliment.