Sex at Dawn

Nixon, Richard, 194

Nolan, Patrick, 191

nonpossessiveness, 93, 126-27

North America, 159, 241

novelty, sexual, 288-300, 345n

nymphomania, 251, 285

O (Margolis), 251-52

Ohio, University of, 21

On Human Nature (Wilson), 37

On the Origin of Species (C. Darwin), 27, 36, 245

Oppenheimer, Frank, 93

oral sex, 283, 344n-45n

orangutans, 1, 61, 62, 62, 63, 115, 187, 215, 221, 224

sperm competition and, 230

orgasms:

female, 10, 13, 28, 245, 247-51, 255-58, 262-64, 266-68, 274, 294, 340n-41n, 342n

health and, 238

male, 10, 13, 263-64, 267, 268, 274, 341n-42n, 344n multiple, 10, 13, 342n oxytocin and, 215n

simultaneous, 341n-42n

“Original Affluent Society, The” (Sahlins), 176

Origins of Virtue, The (Ridley), 177

Orwell, George, 147, 158

Ostrom, Elinor, 170

Our Inner Ape (de Waal), 75

ovulation, 8, 57, 85, 116, 224, 227, 239, 274-75

age of menarche and, 159

in chimps, 69

concealed, 35, 48, 58-60, 69, 102, 262, 321n copulation calls and, 257 Oxford University, 157 oxytocin, 72, 215n

pair bonds, 7-8, 34, 59, 73-77, 85, 101, 111, 115-19, 136, 216-17

long-term, 11, 73, 75, 118, 262-63 Papua New Guinea, 159, 185, 331n Paraguay, 91-92, 119

paraphilias, 280-81 parental investment: female, 42, 49, 53

male, 7, 13, 26, 35, 48, 49, 51-55, 126, 128, 322n

Parental Investment and Sexual Selection (Trivers), 115-16

Parker, Geoffrey, 220

Patanowateri, 195

paternity, 94, 235, 265

partible, 90-91, 103, 108, 340n

paternity certainty, 8, 15, 49, 54, 56, 99, 104, 124-37, 149 genetics and, 25, 54, 56, 141 patriarchy, 131-34, 254

peacefulness, 102, 178, 179, 210-11, 212, 317n pedophilia, 280-81 Penang, xi-xiii penguins, 134-35

penis, 12, 30, 140, 215, 222, 223, 230, 233-43, 266, 286, 288 size of, 224, 235-36, 235, 252, 253, 339n

Perel, Esther, 307, 309

perfume, 57, 262

Peter Pan Complex, 5

Peterson, Dale, 65, 186, 187, 332n

pheromones, 346n

Pinker, Steven, 28, 49, 183-85, 184, 192, 194, 210, 255, 317n, 330n, 332n

Piraha, 121

plasticity, erotic, 272-81

pleasure, sexual, 6, 59, 85, 284, 285, 320n

of males vs. females, 39-40, 47, 304

quantity vs. quality of, 40

plethysmographs, 273

Plotz, David, 163

politics, 176-81, 211, 217

hierarchy and, 9, 143

Pollan, Michael, 335n

Pollock, Donald, 94n, 105, 125-26 Polo, Marco, 127, 130 Polonius, 305

polyamorous families, 305-6, 310 polyandry, 43, 222, 225 polygamy, 28

polygyny, 11, 28, 43, 66, 217-18, 219, 222-23, 240, 242, 245, 263, 344n

mating calls and, 256, 257

Polynesia, 108-9

population growth, 9, 33, 154-56, 156, 158-60, 169, 328n

foragers and, 156, 159, 190, 326n, 327n

land and, 203-4

war and, 191, 193, 203