![](/files/02/66/56/f026656/public/2ef551086588a968abff1b9f23537cb8.gif) | Serotonin, 180, 198, 260-62
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![](/files/02/66/56/f026656/public/2ef551086588a968abff1b9f23537cb8.gif) | Sex drive, 35, 50n, 62, 72, 334-42, 349
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![](/files/02/66/56/f026656/public/2ef551086588a968abff1b9f23537cb8.gif) | and danger, 56, 72
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![](/files/02/66/56/f026656/public/2ef551086588a968abff1b9f23537cb8.gif) | primates, 333-34
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![](/files/02/66/56/f026656/public/2ef551086588a968abff1b9f23537cb8.gif) | See also Promiscuity
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![](/files/02/66/56/f026656/public/2ef551086588a968abff1b9f23537cb8.gif) | Sex (gender) determination, 39
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![](/files/02/66/56/f026656/public/2ef551086588a968abff1b9f23537cb8.gif) | and female as ancestral form, 24, 40-45, 46
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![](/files/02/66/56/f026656/public/2ef551086588a968abff1b9f23537cb8.gif) | hormones and, see Sex (sex steroid) hormones
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![](/files/02/66/56/f026656/public/2ef551086588a968abff1b9f23537cb8.gif) | by male gamete, 19n
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![](/files/02/66/56/f026656/public/2ef551086588a968abff1b9f23537cb8.gif) | in reptiles, 40-41
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![](/files/02/66/56/f026656/public/2ef551086588a968abff1b9f23537cb8.gif) | by SRY gene, 30, 40
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![](/files/02/66/56/f026656/public/2ef551086588a968abff1b9f23537cb8.gif) | Sex in America (University of Chicago survey), 73
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![](/files/02/66/56/f026656/public/2ef551086588a968abff1b9f23537cb8.gif) | Sex (sex steroid) hormones, 110, 178, 180-82, 311
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