The Recognitions - pg. 178

When they both got married they both wanted to write. Everything was fine until the books came out, then they found they'd written about each other. That was the only reason either of them wanted to get married, to study the other one. They used to sit and ask about each other's childhood, and all kinds of things, and they both thought the other one was doing it for love. Now, they just watch each other's sales, and whoever's ahead takes all the cream at breakfast.