Many a relationship has foundered on the rock of Higamus-Hogamus. Nevertheless, the sooner it gets dealt with the better the chance for the relationship to survive. It also means a quicker and kinder death to a romance if this basic agreement cannot be reached. Honesty and willing Polyamorous Commitment are the basic building blocks all partners must use to build a lasting Open Relationship.
Once over that hurdle, next comes a set of ground rules for conducting the relationships. Any relationship profits by ground rules, even a one-night stand. Nowadays, the state of sexuality being risky, such considerations are more than a politeness; they can be a lifesaver.
Never put energy into any Secondary relationships when there is an active conflict within the Primary. This has to be bedrock or the Primary will eventually fold.
The difficulty with this rule is that if both partners are not equally committed to the openness of the relationship, it can be used as a gun in their disagreements. By deliberately picking a fight just before Primary A goes to see a Secondary sweetie, Primary B can control her spouse and prevent him from ever having successful Secondary relations. This behavior is fraught with dishonesty and secret monogamous agendas; if it is persistently indulged in, it is symptomatic of a fundamental problem with the basic principles. If Partner B plays this game with Partner A's satellite assignations while continuing to pursue his own, B is an out-and-out hypocrite and needs to be called on his bullshit in no uncertain terms!
Nevertheless, this rule is the safety valve for sanity and preservation of Primary relationships and should be followed with scrupulous integrity. It is a good idea for Primary partners to have an agreed upon set of signals or a formally stated phrase to politely request their Primary to postpone or cancel the secondary assignation so that the energy can be put into the Primary relationship for fence mending or bonding. This ritualized request can be structured so as to avoid loaded terminology and to decrease the negative emotional charge. Frivolous use of this signal is very destructive of it, as is refusal to participate in healing when access to the Primary partner has been obtained.
Territorial jealousy has no place in a polyamorous agreement. However situational jealousy can arise over issues in the relationship when one or more of the partners is feeling neglected. Obviously the best cure for neglect is to focus attention on what has been neglected; the relationship will prosper when all partners are feeling strong and positive about each other. From that strong and healthy center it becomes possible to extend the love to others.
Consult with the Primary partner before becoming sexually involved with a new long-term Secondary lover. The Primary partner must approve of the new person and feel good about them and not feel threatened by the new relationship. Nothing can break up a relationship faster than bringing in a new person who is hostile or inconsiderate to the other Primary partner. On the other hand, the most precious people in my life are the lovers that my Primary partner has brought home to become our mutual life-long friends.
The check and balance on this rule is how often it is invoked by the same person. If it is used all the time by one person, this is patently unfair and is symptomatic of a problem or need that must be addressed. This can be tricky and once again, if honesty is not impeccably observed, the rule can be abused. If a man has a hard time relating to other men for instance, he can use his alienation to pick apart every other lover his wife proposes on some ground or other, leaving her with no satellite relationship that is acceptable to him. The cure for this is for the person who has the problem relating to the same sex to seek a therapy group for people who want to overcome this alienation.
Different rules may be used to apply to one-night stands or other temporary love affairs. One-night stands are not necessarily frowned upon and can be a memorable experience, but some Primaries choose to not allow any such brief flings as too risky, while others feel that such happenings add spice and are especially welcome during business trips or other enforced separations. The "ask first" rule may be suspended for the duration of the separation.
All new potential lovers are immediately told of any existing Primary relationship so that they genuinely understand the primacy of that existing relationship. None of this hiding your wedding ring business! Satellite lovers have a right to know where they truly stand and must not have any false illusions or hidden agendas of their own. For instance, in a triadic relationship of two women and one man, there is occasionally a solitary satellite lover who wants to "cut that little filly right out of the herd." If satellite lovers are really seeking a monogamous relationship then they will not be satisfied with the role of a long term Secondary relationship, and it is better that they find this out before any damage is done to either side.