Attractiveness in speech patterns appears to be a form of what's known as 'sexual dimorphism' – a strong difference in any characteristic between the two sexes other than the sexual organs. 'From a sexual selection standpoint, males with traits that are slightly more masculine than average are typically preferred,' said study author Dr Daniel Stehr, [graduate student] at the University of California, Irvine. 'In this context it would make males with less clear speech more attractive.'

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