Falling in love was not really a choice; it just struck me.

Good-looking people are always looking for other good-looking people.

If we remained perpetually infatuated, we couldn't eat, sleep or work.

There's all kinds of reasons that you fall in love with one person rather than another: Timing is important. Proximity is important. Mystery is important. You fall in love with somebody who's somewhat mysterious, in part because mystery elevates dopamine in the brain, probably pushes you over that threshold to fall in love.

You can really get poked in the back and not feel it very much, but just a feather around your lips and you really do feel it.

Hair that looks like it's been naturally sun-bleached makes you seem youthful, like you spend a lot of time outdoors. And that appeals to most people.

If two very different people pool their DNA, they'll create more genetic variety, and their young will come to the job of parenting with a wider array of skills.