Puberty, 49, 118-119, 260-288, 295

see also Adolescence and adolescents

adrenal gland, 119, 262, 265, 266, 269, 270, 271, 273, 277, 278

adrenarche, 119, 265, 266, 267, 271, 279, 301

age at, 21, 23, 119, 126, 153, 158, 262, 274

energetics, 266-267, 268, 296, 298

estrogen, 111, 119, 263-264

evolutionary issues, 260-261, 268, 277

family formation and, 119, 262

gonadarche, 264, 265, 266, 295

gonadotropin-releasing hormone (GnRH), 116

growth spurt, 11, 144, 261, 264-266, 267, 268, 296, 298, 300

hypothalamus, 118, 264, 266, 267, 269, 270

menarche, 11, 49, 118, 124, 266, 298

baboon life histories, 144, 147, 153

neural factors, 118, 263-264, 268-279

pituitary gland, 118, 264, 266, 267, 269, 274

primate studies, 261, 264-265, 279

racial/ethnic factors, 274

sociocultural factors, 275-276

stress, 122-124, 126, 276

testosterone, 117, 118-119, 261, 263-264, 266-267, 270-278 (passim)

twin studies, 23

Public health, see Medical care services

Q

Quality vs. quantity, 12-13, 14, 50, 147-148, 149, 150, 162, 172, 184, 201-202, 323-338

R

Racial/ethnic factors, 32

behavioral genetics, 19, 24, 32, 46-47

family size, 19, 208-209

pregnancy, age at first, 205

pubertal timing, 274

twin studies, 24

Rational choice models, 12, 48, 322-338

Regression analysis, 55-56, 186, 187, 236-237

Risk taking, 11, 15, 22, 34-35, 190, 268, 272-273

S

Sampling

see also Cohort studies

adoptee studies, 28

hormonal effects on sexual behavior, 115-116

twin studies, 23-25, 27-28

Schizophrenia, 18, 22, 26, 28

School experiences, 6, 209-210

Secondary sexual characteristics, 111-112, 117, 118, 119, 120, 123, 124, 268-269, 296, 301, 349

age factors, 111-112, 117

hair, 111, 117, 118, 119

parental investment and, 178

Sedentism, 187

Semen, see Sperm and semen

Sex differences, see Gender factors;

Hormonal processes;

Secondary sexual characteristics

Sexual behavior, 49, 92, 99-100, 340, 347-350

adolescents, 52, 118-119, 261-279 (passim)

age factors, general, 4, 19, 49, 52, 117, 119

attitudes and beliefs about, 115-116, 252

baboon life histories, 147

behavioral genetics, 18, 19, 33, 341

coevolution, sexually antagonistic, 11, 29, 224-252 (passim)

contraception and contraceptives, 1, 3, 7, 13, 29, 105, 120-121, 240

desire and, 8, 13, 16, 49, 119, 209

drugs, effect on, 106, 108

economic theories, 48

evolutionary anthropology, 195, 341

hormonal influences, 35, 94-95, 98-99, 104, 105, 113-119 (passim), 121, 261-279 (passim)

life history theory, 147, 302

menstrual cycle, 115, 116, 236, 237-239

neurochemistry of, 99-100

parent-child bonding and, 16

promiscuity, 34



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