A relationship that allows behavior, affection and sexual expression with partners external of the relationship. The most common forms of non-monogamy are swinging, open relationships, and polyamory.
Non-monogamy is different from cheating since all of the involved parties are aware and consenting of the activity occurring outside of the relationship.
Responsible Non-monogamy will often occur in mature relationships and is different from standard non-monogamy. A relationship that is engaging in responsible non-monogamy will have explicit rules and conditions which must be adhered to in order for one of the partners to pursue sexual behavior outside of the relationship. A common condition of responsible non-monogamy is a ‘condom contract’, wherein sexual protection during intercourse outside of the core relationship is mandatory.
Larry and Janet had been together for a while and decided to spice things up by letting one another engage in non-monogamous behavior. They had some clear rules and were completely transparent with their sexual wants and endeavors.