| Mammalia, term coined, 134-35
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| Mammary gland, 143, 144, 148-52 passim , 168
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| as modified placenta, 147, 154
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| as modified sweat gland, 129, 146, 147
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| underrated/overrated, 146, 159
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| See also Breast(s)
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| Mandeville, Geoffrey de, 62
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| Marijuana and orgasm, 71
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| Marijuana-like molecule (anandamide), 111, 112
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| Marriage, 323-24, 327, 329, 331-32
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| and divorce, 353-54
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| and orgasm, 73, 74
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| origins of, 351-53
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|