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http://www.theaustralian.com.au/hig...y/news-story/9ed5a9ffecb46ea5413326fd73d68b85
More surprising is the fact that men respond to the lumbar curve of a woman’s spine, which allows her to deal with pregnancy’s centre of gravity shift.
A former student of Buss’s, David Lewis, calculated the optimum lumbar curve biomechanically — and showed that men found exactly this degree of curvature most attractive.
When i think about lumbar curve i think about what she would look like face down, ass up.