![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | testosterone and receptivity to, 100
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | Sexual dimorphism, 3335
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | Sexual selection, 2933, 3538.
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | See also Courtship.
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | behavioral tendencies and, 34
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | estrogen and, 30
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | friendship, capacity for and, 33
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | testosterone and genes of different species, 29
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | Shadows of Forgotten Ancestors (Sagan & Druyan), 175
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | Shaker religious sect, 117
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | Shakespeare, William, 4344, 96, 114
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | Short, Roger, 169
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | Simon, Herbert, 185186
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