If two people stare at each other for more than a few seconds, it means they are about to either make love or fight. Something similar might be said about human societies. If two nearby societies are in contact for any length of time, they will either trade or fight. The first is non-zero-sum social integration, and the second ultimately brings it.

Being a person's true friend means endorsing the untruths he holds dearest.

Actually, there is a sense in which polygynous marriage has not been the historical norm - even where polygyny is permitted, multiple wives are generally reserved for a relatively few men who can afford them or qualify via formal rank. For eons and eons, most marriages have been monogamous, even though most societies haven't been

We're all puppets, and our best hope for even partial liberation is to try to decipher the logic of the puppeteer. Just because natural selection created us doesn't mean we have to slavishly follow its peculiar agenda. (If anything, we might be tempted to spite it for all the ridiculous baggage it's saddled us with.)

We are built to be effective animals, not happy ones.

Think of it : zillions and zillions of organisms running around, each under the hypnotic spell of a single truth, all these truths identical, and all logically incompatible with one another : 'My hereditary material is the most important material on earth; its survival justifies your frustration, pain, even death'. And you are one of those organisms, living your life in the thrall of a logical absurdity.

Giving men marriage tips is a little like offering Vikings a free booklet titled How Not to Pillage.