Many authors in this area ground their work in Systems Theory, Family Systems, sex research, personality theory and Social Psychology.
They also adopt theories and research generated by sociologists, anthropologists and evolutionary psychologists.
But if I wasn't and I wanted to spice up my life with a bout of infidelity, there are several dating websites designed with that in mind.
Correspondingly, many movies have dealt with affairs, most notably, Long before our modern era, infidelity was a recurrent element in literature and art. The Ten Commandments devotes a specific commandment to it. Similarly, many anthropologists have repeatedly claimed that Homo sapiens throughout its evolution, like most animals, has not been naturally monogamous.
These couples do not face a crisis when the infidelity is exposed.
Another example is a man who discovers his homosexuality in the later part of his marriage and comes to an agreement with his wife that they will stay married but both will pursue extramarital sexual relationships.
The good news is that extramarital affairs are survivable and marriages can even grow stronger when members of the couple deal constructively with the affair by facing it, apologizing and ultimately forgiving or by simply accepting it. Kennedy, Bill Clinton, Thomas Jefferson and French President Francois Mitterand (whose mistress stood beside his wife at his funeral) and other public figures, such as Prince Charles, Marion Barry, Gary Hart, Frank Gifford, poet James Dickey, writer John Cheever, Martin Luther King, television evangelist Jim Bakker and Representative Bob Livingston, Eleanor Roosevelt was strongly rumored to have had an affair with journalist Lorena Hickok and similar rumors surrounded Princess Diana extra marital affair.
In fact, almost a third of all marriages may need to confront and deal with the aftermath of extramarital affairs and women's infidelity statistics are swiftly catching up to those of men. Even more bad news is that Internet or online affairs have become extremely prevalent and, some claim, pose one of the biggest threats to modern marriage.