Lewis, D. Evolution and Human Behavior. What they found was that as the degree of lumbar curvature approached the theoretically optimal level i.
As predicted, men showed a preference for female figures that featured lumbar curvature, not figures that generally had larger gluteal mass. Lewis, D. To read more about this research, see:
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Evolution and Human Behavior. In the second study, researchers sought to determine whether lumbar curving is really what men are picking up on, or if guys just like big butts in general.
Attractiveness ratings decreased once lumbar curvature exceeded that level excessive spinal curving can pose a whole other set of health issues, so it makes sense that any preference for spinal curving would only exist to some degree. Lewis, D. To read more about this research, see: