Divorce is a common occurance among adults in the Unites States, regardless of how people organize their relationships. Monogamous, cheating, and polyamorous people divorce, and the common thread among them all is that the ways in which people handle their relationships determine how those relationships progress or end.
Polyamorous After Divorce
When people attempt monogamy and it goes badly, some of them decide to try polyamory. This is especially true for people who have had tremendous difficulty remaining monogamous with their partners. For people who are polyamorous by orientation, it can be extremely painful to attempt to squash themselves into a monogamous mold. These folks sometimes decide to establish poly relationships that allow them to live honestly and openly in a relationship style that works better for them.
Polyamorous Instead of Divorce
For some people, becoming polyamorous can save a marriage. When people truly love each other and treat each other well but have difficulty remaining sexually exclusive or do not get important needs met in their marital relationship, becoming polyamorous can support a marriage by bringing extra-marital sexuality out into the open where it can be honestly discussed. In some instances both people in a marriage establish additional relationships with others outside of the marriage. In other cases termed mono-poly or poly-mono, one of the partners has multiple relationships and the other remains monogamous even though they could have other partners if they wished but simply choose not to avail themselves of that option.