Do You Like Big Butts? Science Might Have An Answer Why.

"Over the course of human history, women faced the adaptive problem of a forwarded-shifted center of mass during pregnancy," study co-author Eric Russell, a graduate student in psychology at the University of Texas at Arlington, told The Huffington Post in an email. "Women with a greater degree of lumbar curvature ... were able to redistribute this center of mass to reduce the strain of pregnancy. Thus, we hypothesized that men should have a psychological adaptation to prefer these women as mating partners."

In short, male preference for this specific anatomical form likely evolved because it enabled women to sustain multiple pregnancies without injury and to forage productively during pregnancy.

For the study, more than 300 men rated the attractiveness of female silhouettes that had lumbar curvatures ranging from 26 to 61 degrees.

The men found a moderate curvature -- about 45.5 degrees -- to be just right. Such a curvature would have conferred evolutionary advantages without presenting health problems like back pain and slipped disks, the researchers said."

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