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’s muscles; natural selection and; penis; runaway selection model of; sex appeal and; sexual maturity; sexual ornamentation; truth in advertising principle of; women’s breasts; women’s fat

Hunter-gatherers: conflict of interests and; lactational amenorrhea and; weaning and; women and. See also Hunters, men as

Hunters, men as; Aché Indians and; extramarital sex and; Hazda Indians and; meat provisioning and; as providers; as show-offs; women’s jobs versus

Hurtado, A. Magdalena

Hutterite women, babies produced by

Imprisonment of women, confidence in paternity and

Infanticide: conflict of interests leading to; many-fathers theory and

Infibulation, confidence in paternity and

Insects, mating systems of

Interior vagina

Internal fertilization; alternative opportunities foreclosed by child care and; birds and; confidence of parenthood and; evolutionary commitment of mammals to; obligate parental investment and

Inuit (Eskimo) men, hunting by

Investment in young: external fertilization and; male lactation and; parental care and

Ismail the Bloodthirsty, Emperor of Morocco

Jacanas (lily-trotters), sex-role-reversal polyandry and

Jackrabbits, lactation and

Jones, Nicholas Blurton

Jost, Alfred

Kangaroos, parental care and

Kaplan, H.

Ketengban tribe, phallocarps in

Killer whales, menopause and

Kingpin principle, aging and

Kodric-Brown, Astrid

Labia majora

Labia minora

Lactational amenorrhea

Lactation (female); evolutionary commitment to; hormones and; humans and; infanticide terminating; mammals and; mammary gland development and; nipple stimulation and; origin of; pregnancy and; species differences and; weaning and. See also Lactation (male)

Lactation (male); advantages of; conditions favoring; evolutionary commitment and; hormones and; male roles and; nipple stimulation and; physiological feasibility of; pregnancy necessity and; psychological obstacles to; spontaneous lactation and; starvation recovery and; technological possibility of

Langur monkeys, concealed ovulation and

Lek mating system, of hammer-headed fruit bats

Life span, female reproduction and

Lily-trotters. See Jacanas

Lions: infanticide and; parental care and

Long-Tailed Widowbirds, tails as signal and

Macaques, ovulatory signals and. See also Barbary macaques; Rhesus macaques; Stumptailed macaques

Male lactation. See Lactation (male)

Male pseudohermaphrodites

Males (human): American men; divorce and; duration of fertility of; facial beauty and; mammary gland development and, see also Lactation (male); menopause and; muscles and; in New Guinea; parental care and ; penis of; as providers; role of; sexual maturity of; sexual ornamentation and; as show-offs; voice change and. See also Extramarital sex; Hunters, men as; Lactation (male)

Males (mammalian): duration of fertility of; infanticide and; mammary gland development and, see also Lactation (male); meat provisioning and; menopause and; parental care and; post-copulatory desertion and; role of; sex-role-reversal polyandry and; signals and. See also Lactation (male)

Mammalian sexuality; fertility time span and; for fertilization; harems and; human sexuality compared to; male’s role and; mating systems; menopause and; one-night stands and; ovulatory signals and; public sex and. See also Females (mammalian); Internal fertilization; Males (mammalian); Parental care (mammalian)

Mammary gland development, hormones and. See also Breasts; under Lactation

Mann, Thomas

Mantises, sexual cannibalism and

Many fathers theory, of concealed ovulation

Marmosets: as monogamous; ovulatory signals and; parental care and

Marriage, by humans

Marsupial mice; menopause in males of; sex for fertilization and

Marsupials: internal fertilization and; lactation and. See also Kangaroos

Mating systems: concealed ovulation and; evolutionary changes and; of primates

Men. See under Male

Menopause; aging and; burden of parental dependence of child and; costs and benefits of; definition of; depletion and aging of egg supply and; extended role of postmenopausal women and; importance to society of