Ten thousand years ago, when I was in my 20s, I spent a couple of months in Taiwan. My college roommate had married a Chinese guy and was clearly going to stay there, and I was in between jobs, and I wanted to see what her life was going to be like, so off I went. We were so young that it never occurred to us that having a third person move in with a couple who had just gotten married might not be the greatest idea, although I have to say, for the most part we all got along…