Sex at Dawn

Bellis, Mark, 264, 338n, 342n Belliveau, Jeannette, 289 Bergner, Daniel, 273, 343n Berman, Morris, 68 Bernard, Jessie, 295 Bernays, Edward, 345n Berns, Gregory S., 168 betrayal, 4, 167-68, 297, 300 Betzig, Laura, 112 Beyond War (Fry), 193 Bhutan, 221-22

Bible, 81-82, 98, 138, 205, 233-34, 325n

Genesis in, 35, 163, 233

life span in, 53

Psalms in, 200

Bird-David, Nurit, 174

birds, 36, 118, 136-37, 243

Birdsell, Joseph, 203

Birkhead, Tim, 54

birth control, 40, 57

birth control pills, 76, 275, 343n, 344n

bisexuality, 276-77

bluebirds, 136

Bodley, John, 171-72

body fat, low, 159

body-size dimorphism, 215-19, 222, 224, 242, 336n-37n

body-weight ratios, 205

Boehm, Christopher, 179

Bogucki, Peter, 100, 243

Bolivia, 145

Bolton, Michael, 146

bonding, 104, 149, 171, 308

female-female, 65, 78

group, 315n

mother-child, 106-7

in social organization of apes, 65-66

bone studies, 193, 201, 202, 204-5, 216-17

health and, 173-74, 175

bonobos, 61-65, 62, 69-75, 82, 216-20, 222, 224, 230, 239, 246, 258, 336n

body-size dimorphism in, 216-19

chimps compared with, 69-72, 77-78, 97, 101

copulation duration in, 236, 236

female sexual capacity of, 58, 69, 72-74, 101, 102, 239, 268 group sex of, 12

human erotic response to, 272, 273

humans compared with, 1, 61-62, 63 , 69, 72-74, 77-78, 85, 97, 101-2, 102, 134, 225, 234, 240, 242, 243, 245-46, 260, 320n, 332n

multimale-multifemale mating systems of, 45, 66 penis of, 235, 339n

separation of chimps from, 62, 74, 318n social organization of, 63-64, 65-66, 191

swellings of, 260, 261-62, 261

testicles of, 220, 222, 223, 225, 226-27, 234, 240

warfare and, 186-87, 197-98, 332n

Borman, Frank, 334n

Botswana, 11, 119, 176, 206

Bowlby, John, 29

brain, 8, 140, 171, 205, 216, 274, 319n

Bailey’s fMRI scans of, 276-77

big, 34, 84, 85, 94

cooperation and, 168

of vampire bats, 100

Brazil, 96, 103, 119, 121

infant deaths in, 203

breastfeeding, 7, 13, 42, 77, 111, 159, 259-60, 328n, 342n sharing of, 11, 105

breasts, 13, 35, 224, 259-62, 337n, 342n

augmentation of, 259, 342n Bristol, University of, 238 Brooks, Nick, 327 Brown, Janelle, 260 Bruhn, John, 162 Bryan, William Jennings, 182 Bubonic plague, 207 bukkake, 338n bulla, 233 bulusela, 346n Burkino Faso, 105-6 Burma, 140

Buss, David, 53, 55, 141-45 butt bra, 260, 261 butt-crack, 260, 337n buttocks, 260, 261 Caesar, Julius, 95

Caesar and Cleopatra (Shaw), 172 Cai Hua, 129 California, 140, 205 Cambridge University, 161 Campbell, Joseph, 22 Canada, 190

cancer, 206, 209, 238, 297-98

Canela, 103, 120, 138, 146

Cantet, Laurent, 345n

Carter, C. Sue, 136

Cartwright, Samuel, 118