Psychologist Dr Nicolas Gueguen, who led the research, believes teenage girls associate smiling with attractiveness from role models such as actresses, female pop stars and models. u00a0 But boys, whose role models include rock bands and sport stars, tend to be sulkier and moodier. u00a0 "Women were more likely than men to smile expansively when photographed," the Daily Express quoted Dr Gueguen as saying. u00a0 The study was published in Research Journal of International Studies
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