“Apes have a wide variety of sexual arrangements. That means, by the way, that there is no such thing as an ape legacy that humans are doomed to live by.”

“Even evolutionary explanations of the traditional division of labor by sex do not imply that it is unchangeable, natural in the sense of good, or something that should be forced on individual women...”

“As technology accumulates and people in more parts of the planet become interdependent, the hatred between them tends to decrease, for the simple reason that you can't kill someone and trade with h...”

“Instead of asking, Why is there war? we might ask, Why is there peace? We can obsess not just over what we have been doing wrong but also over what we have been doing right. Because we have been do...”

“The main reason that violence correlates with low socioeconomic status today is that the elites and the middle class pursue justice with the legal system while the lower classes resort to what scho...”

“Friendship, like other kinds of altruism, is vulnerable to cheaters, and we have a special name for them: fair-weather friends. These sham friends reap the benefits of associating with a valuable p...”

“Sex can be used either for self-affirmation or for self-transcendence either to intensify the ego and consolidate the social persona by some kind of conspicuous embarkation and heroic conquest, or...”

“He didn't know all that much about how the machinery worked anyway. Such knowledge was for specialists. In war, as in love, he was a fearless, happy-go-lucky adventurer.”

“If she did experience sex--or something close to it--in high school, I'm sure it would have been less out of sexual desire or love than literary curiosity.”