| testosterone and receptivity to, 100
|
| Sexual dimorphism, 3335
|
| Sexual selection, 2933, 3538.
|
| See also Courtship.
|
| behavioral tendencies and, 34
|
| estrogen and, 30
|
| friendship, capacity for and, 33
|
| testosterone and genes of different species, 29
|
| Shadows of Forgotten Ancestors (Sagan & Druyan), 175
|
| Shaker religious sect, 117
|
| Shakespeare, William, 4344, 96, 114
|
| Short, Roger, 169
|
| Simon, Herbert, 185186
|
|