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According to one 2010 paper, which actually tried to identify the correlates of the behavior, albeit in a small sample (n=13, 3 males, 10 females) that was referred to a clinic: The median age at the first incident was 19.5 months (range, 4-36 months); the median masturbation frequency, 4 times/day; and the median duration of each event, 3.9 min. The ...


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