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Republish our articles for free, online or in print, under Creative Commons licence. Writing in the Proceedings of the National Academy of Sciences a journal commonly known by its initials as PNAS , Brian Mautz , Bob Wong , Richard Peters and Michael Jennions use a clever experimental manipulation of computer-generated imagery - CGI - to test the effects of variation in penis size relative to height and torso shape shoulder width relative to waist width on the attractiveness of male bodies to women. While they found that torso shape was by far the most important determinant of attractiveness, penis size has about as much influence on attractiveness as height. And yet for such a tabloid-ready topic, the paper itself is a study in how science should proceed in sober and restrained steps. Genitalia tend to vary more dramatically than almost any other physical trait. And evolutionary biology has made stunning progress in resolving why.

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