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memories of old women and; increase in expected life span and; kingpin principle and; in mammals; more children produced by; risk of death in childbirth and; risks in infants of older mothers and

Menstrual cycle, lactational amenorrhea and. See also Menopause

Mice: aging and; duration of fertility of; mammary glands in male; repair versus reproduction and. See also Marsupial mice

Midwife toads, parental care and

Missing Link, in concealed ovulation evolution

Mixed reproductive strategy, of Pied Flycatchers

Møller, Anders

Monkeys: concealed ovulation and; monogamy and; promiscuous mating system of. See also Night monkeys; Spider monkeys

Monogamy: concealed ovulation and; daddy-at-home theory and; of humans; of primates

Monotremes: internal fertilization and; lactation and

Mormons, polygyny and

Mullerian ducts

Mullerian inhibiting hormone; male pseudohermaphrodites and

Muscles, as signal in human males

Napoleon the Third

Natural selection; behavior and; concealed ovulation and; lactation and; male lactation and; menopause and; parental care and; repair and reproduction and; sexuality and; signals and; vertebrate limbs and

New Guinea: bride prices in; men’s role in; phallocarps in

Night monkeys, concealed ovulation and

Nizam of Hyderabad

Noonan, Katharine

Nursing. See under Lactation

O’Connell, James

Octopus, big-bang reproduction (semelparity) and

Offspring, conflict of interest between parents and

Olfactory signals

One-night stands

On the Origin of Species (Darwin)

Opportunity. See Foreclosed opportunity

Orangutans: concealed ovulation and; head shape indicating sex and; humans compared to; one-night stands and; ovulatory signs and; penis of; sexuality of

Oring, Lewis

Ostriches, parental care and

Ovaries

Ovulatory signals; evolutionary changes in; in mammalian sexuality; in primates. See also Concealed ovulation

Parental care; alternative opportunities foreclosed by child care and; battle of the sexes and; confidence of parenthood and; male lactation and; sex differences in obligate parental investment and

Parental care (human); alternative opportunities foreclosed by child care and; battle of the sexes and; burden of long period of; confidence of parenthood and; conflict of interests and; coparenting and; females and; males and; polygyny and; recreational sex and; sex differences in obligate parental investment and; unwed mothers and

Parental care (mammalian); alternative opportunities foreclosed by child care and, 23–24; battle of the sexes and; choices in; confidence of parenthood and; coparenting; females and; lactation and; male post-copulatory desertion and; males and; natural selection and; sex and; sex differences in obligate parental investment and; sex-role-reversal polyandry and

Parenthood, confidence of. See Confidence of parenthood

Parricide, conflict of interests leading to

Paternal care. See also under Male

Peacocks; tail of

Penis; internal fertilization and; as signal in human males

Penis shaft

Phalaropes. See Wilson’s Phalaropes

Phallocarps

Pheromones

Pied Flycatchers: coparenthood and; sex for fertilization and

Pigeons: lactation and; small eggs of

Pilot whales, menopause and

Placentals, lactation and

Platypus, internal fertilization and

Plummage, as signal

Polyandry; humans and; sex-role-reversal; Tre-ba of Tibet and

Polygamy, harems and

Polygyny: coparenthood in Pied Flycatchers and; humans and

Porcupines, aging and

Post-copulatory desertion by males; exceptions to

Pregnancy: duration of; lactation and

Premarital sex, humans and

Primary female, polygyny in Pied Flycatchers and

Primates: concealed ovulation studied with; family tree of; mammary glands and; mating systems of; ovulatory signals and; promiscuity of. See also specific primates.e. Apes; Baboons; Chimpanzees, etc.

Primordial gonad

Private sex, humans and

Progesterone, lactation and

Prolactin, lactation and

Promiscuity: concealed ovulation and; of humans; of primates

Prostate gland

Prostitution theory, of concealed ovulation

Providers, men as

Proximate mechanism, ultimate