| Male; Mother-daughter relationship; Mothering strategies; Mother-offspring conflict
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| Parthenogenesis, 42, 43, 342
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| Partible paternity, 349-51
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| Paternity statistics, Liverpool study, 75
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| Patriarchy, evolution of, 276-82.
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| See also Male (dominance)
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| Peccei, Jocelyn, 219-20
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| Pedersen, Cort, 303, 320
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| Penis
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| development of, 30, 31, 47
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| homologue of, 58-63 passim , 66, 84
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| size of, 57-58
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| Pergonal (ovulatory hormone), 9
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