My wife, Jill, and I have lived next door to Hank and Rebecca for about six years. During that time, what started as a friendship blossomed into something bigger and better. They were always the type of people we could go to for a cup of sugar in a pinch, and eventually, we started to lean on one another in additional ways.

In truth, we operate more as a unit than as acquaintances. Two nights a week, we take turns cooking dinner for one another. One of those nights we host them at our place, and for the other, they welcome us at theirs. Then at the end of the meal, we indulge in something sinful for dessert — that is to say, we swap spouses.

On the nights that we host, after the last plate is cleared, my wife goes next door with Hank, and Rebecca stays behind with me. When they host, Jill stays behind at... Read More