assumptions of, 99, 137, 142 of evolutionary psychology, 38-39, 48-53 extended sexual receptivity and concealed ovulation in, 48, 58-60 female libido in, 38-39, 47-58 female orgasm in, 262-63
male parental investment in, 7, 13, 26, 35, 48, 49, 51-55, 126, 128, 322n
paternity certainty in, 48, 55-58, 124-37, 142 sexual economics and, 48-51
sexual jealousy in, 35, 48, 55-58, 92, 142
testicles and, 227
war between the sexes in, 269-70
Stanford, Craig, 67
starvation, 164-65, 173, 203, 204
status, 52
of bonobos, 71
of children, 148
female, 9, 14, 57, 71, 132
male, 38, 49, 50, 55, 65-66, 99, 101, 257, 265
Sting, 147
Stone Age Economics (Sahlins), 162-63 straight men, 276-77 erotic plasticity and, 272, 273 stress, 72, 208-10, 296, 336n, 346n stroke, 162, 210 Sudan, 193
suicide, 210, 282 Sullivan, Andrew, 306-7 Sullivan, Ed, 86
sun/moon relation, 311-12, 312, 347n surrogate mothers, 107 survival of the fittest, 35 Sussman, Robert, 188 swans, 136, 137
“Sweaty T-shirt Experiment,” 275, 346n Swedes, 144 swingers, 307-8 Sydney University, 238
Symons, Donald, 51, 57-58, 118-19, 126, 229, 247, 295, 338n
female orgasm as viewed by, 263-64 on sexual novelty, 295-96 syphilis, 130, 206, 207, 250 Tahiti, 95
Tai, 67, 70
Tannahill, Reay, 252
Tanzania, 187-88, 323n
Taylor, Timothy, 14, 175, 316n, 341n
Technology of Orgasm, The (Maines), 247-48, 340n
TED (Technology, Entertainment, Design) conference (2007), 183-84
teeth, 173, 205, 215
television, 5, 32, 41, 143, 288, 317n
Tennyson, Alfred, Lord, 30
testicles, 10, 12, 220, 222-27, 224, 230, 234, 236-43, 266, 340n
testify, 234
testosterone, 267, 281-82, 293-94, 296-98, 344n Thailand, 140, 289, 290
Theory of Moral Sentiments, A (Smith), 328n-29n Theroux, Paul, 69 Thompson, Robert Farris, 86
Tierney, Patrick, 195, 334n Tierra del Fuego, 163-64, 181 Time, 302-3
Tipping Point, The (Gladwell), 171 Tiresias, 39-40, 47, 51 Tissot, Simon Andre, 250 Toba eruption, 191, 328n Todorov, Tzvetan, 316n tools, 76, 176, 196, 216
“Tragedy of the Commons, The” (Hardin), 169-70
translation paradox, 118
Treatise of Human Nature, A (Hume), 61
Treatise on the Disease Produced by
Onanism, A (Tissot), 250
Trivers, Robert, 115-16, 270, 322n
Trobriand Islands, 95
trust, 72, 139, 177, 304-5, 311
tuberculosis, 178-79, 206, 207 Tukanoan, 108 Tulp, Nicolaes, 63 Turchin, Peter, 191 Turkey, 175
Twain, Mark, 81, 244, 285, 290 Uganda, 189
United States, 142, 170, 190, 247, 289, 303, 305, 332n
breast augmentation in, 259
circumcision in, 287
clitorectomies in, 251
money concerns in, 161
open range in, 169
population growth in, 155
suicide in, 282
Urban VIII, Pope, 34
vagina, 140, 265, 266-67, 286
Valentine, Paul, 90-91, 103
vampire bats, 99-100
vasopressin, 324n
Vaupel, James, 201-2
Vedder, Eddie, 166
Ventura, Michael, 86, 320n
Venus of Willendorf, 259
Viagra, 2-3, 299
vibrators, 248-49, 340n
Victorian era, 27-30, 35, 302, 316n
women in, 28, 29, 40, 221
Victorian Frame of Mind, The (Houghton), 29
Vincent of Beauvais, 121-22
violence, 66, 154, 211, 284, 344n
of chimps, 64-65, 67-70, 186-90, 193, 332n-33n
of humans, 68, 75, 83, 127, 323n
see also war
virginity, 120
vocalization, female copulatory (FCV), 13, 255-59
Vonnegut, Kurt, Jr., 149, 209
vulva, 77-78
Wade, Nicholas, 182-83
Walford, Roy, 208-09
Wallace, Alfred Russel, 154-55
Wallis, Samuel, 95
Wall Street, 153
Walum, Hasse, 324n-25n
Wamba, 70
Wang, Hurng-Yi, 227
Waorani Indians, 206
war, 64, 70, 75, 127, 182-99, 210, 284
human, 13, 38, 65, 76, 83, 159, 183-86, 190-99, 204, 327n, 330n-32n
Pinker’s views on, 183-85, 184, 192, 194, 330n, 332n primate origins of, 65, 186, 187-189
spoils of, 190-93, 204
War Before Civilization (Keeley), 23, 184
war between the sexes, 25, 40, 47, 55-58, 269-70
Warao, 121
wealth, 7, 8, 50, 161-66, 217, 265 Wedekind, Claus, 275, 346n Weil, Andrew, 347n Westermark effect, 346n “When a Man Loves a Woman”
(song), 146-47
When Harry Met Sally, 256, 341n Whitman, Walt, 271
Why Men Rule (Goldberg), 132-33, 324n
“Why War?” (Smith), 158
Wilson, Genarlow, 283
Wilson, E. O., 36-37, 47, 104, 149, 301, 326n
Wilson, Margo, 49, 225
Winge, Otto, 220 witchcraft, 251, 252 witchetty grubs, 21, 22 Wolf, Stewart, 162
Women at the Center (Sanday), 133, 324n Woods, Vanessa, 68 Woods, Tiger, 322n
World Health Organization, 120, 240-41, 253
World War II, 307-8, 336n
Wrangham, Richard, 65, 186, 187, 189, 332n
Wright, Robert, 52-53, 57, 270
Wu, Chung-I, 227
Wyckoff, Gerald, 227, 337n
Yang Erche Namu, 126, 127, 128, 130
Yanomami, 184-85, 184, 194-97, 331n, 334n
Yanomamo (Chagnon), 194-97
Young, Brigham, 218
Yucatan, 19, 24, 75, 164, 310, 316n Zeus, 39-40, 228 Zulu, 192-93
They say publishing a book is like having a baby, but it takes longer and hurts more. Appropriately, this “baby” has far more than two parents. There would be no Sex at Dawn without the insight, encouragement, and patience of our families, especially Frank, Julie, and Beth Ryan, Joana and Manel Ruas, Alzira Remane, Celestino Almeida, and Danial Jetha.
Stephen Lang and Henriette Klauser were incredibly generous in helping us put together a convincing book proposal. Our agent, Melissa Flashman, spent countless hours guiding us through the transition from proposal to manuscript. Unlike most agents, she kept reading and offering wise counsel throughout the entire publishing process, for which we are sincerely grateful. Many thanks to Ben Loehnen, our editor at HarperCollins, who believed in the book from the get-go (even while no doubt discreetly disagreeing with some of its content), and assistant editor Matthew Inman, for his rapid-response professionalism. Lisa Wolff did a first-class copyedit, catching more than a few potentially embarrassing mistakes. Those that snuck through or that we slipped in later are nobody’s fault but our own.