This monogamy was necessary to ensure that no one cheated outside of the family lines and that property ownership stayed within the male lineage.

Some people assume that infidelity is a symptom of some fundamental problem in a marriage or com­mitted relationship, ignoring the more important dilemma of whether monogamy is even possible for the average person.

However, it is not clear if these couples are in general less jealous and were more sexual before they negotiated their open relationships.

Open marriages and polyamory works well for couples who tend to see emotional commitment as the monogamy criteria that works best for them.

If their foundation is strong and they can communicate well, and they are flexible in general, they seem to be resilient enough to make it work.

After infidelity however, it is also possible for many couples to stay together and redefine their relationship.