There are so many ways to find out. From a cell phone. From a bank statement. From some weird supermarket encounter. One morning in early January 2005, Wendy Plump's friend came to tell her that her husband was having an affair. It was not a shock. Actually, it explained a lot. But what Wendy was not prepared for was the revelation that her husband also had another child, living within a mile of their family home. Monogamy is one of the most important of the many vows we make in our marriages.