Should marital infidelity necessarily lead to divorce?

This question has not emerged out of nowhere. According to a survey conducted by the Associated Press, infidelity was the reason for divorce in 17% of cases. During the same survey 22% of married men and 14% of married women said that they had extra-marital relations. If this is an official statistic, then what is the real number of cheating spouses? It is well-known that people, especially women, don’t always tell the truth during such surveys. Even if they are assured that the survey is anonymous, not everyone would want to reveal intimate details about their life. Therefore, we can assume that the real percentage of people having extra-marital relations is much higher. Peggy Vaughan, author of "The Monogamy Myth," has come to the same conclusion: "60 percent of men and 40 percent of women will have an extramarital affair in their married life."