 | masculine traits, 40, 72, 138139
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 | masculine traits from in utero testosterone, 1215
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 | menstrual cycles and testosterone levels, 100, 105
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 | photography, preferences in, 54
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 | pregnancy, and testosterone levels in mothers, 1213, 1415
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 | prison inmates, 68, 7980, 89
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 | relationships, choice of high-testosterone men, 112116
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 | reproduction and, 25
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 | sexual attraction and testosterone, 4
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 | smiling in, 69, 69 n , 157, 158, 162163
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 | spatial skills, 5158
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 | testosterone, high-versus low-levels in, 57, 61, 139
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 | testosterone levels across the life span, 1516, 16
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