| Serotonin, 180, 198, 260-62
|
| Sex drive, 35, 50n, 62, 72, 334-42, 349
|
| and danger, 56, 72
|
| primates, 333-34
|
| See also Promiscuity
|
| Sex (gender) determination, 39
|
| and female as ancestral form, 24, 40-45, 46
|
| hormones and, see Sex (sex steroid) hormones
|
| by male gamete, 19n
|
| in reptiles, 40-41
|
| by SRY gene, 30, 40
|
| Sex in America (University of Chicago survey), 73
|
| Sex (sex steroid) hormones, 110, 178, 180-82, 311
|
|