Rules and boundaries that hold

Rules and boundaries are not the same thing

This distinction is used constantly in the community and is worth getting right, because it changes how an agreement behaves under pressure.

A boundary is a statement about yourself and what you will do. I will not stay in a relationship where I am lied to. I need to know before you sleep with someone new, not after. Boundaries are enforceable because the only person they require anything of is the person setting them.

A rule is a statement about what someone else may do. You may not see anyone more than twice. You may not sleep with anyone I know. Rules can be perfectly reasonable and they have a structural weakness: they depend on control, and the moment the other person genuinely wants something the rule forbids, the rule is doing nothing except deciding whether you find out.

The agreements couples actually make

Across a wide range of arrangements, the same areas come up. Not all of these need a decision at the outset, and trying to settle every one before anything has happened is its own failure mode.

• Scope. Sexual connections only, or romantic ones too. This is the single most consequential question and the one most often left vague.
• Disclosure. Whether you tell each other before, after, or in detail. Both extremes cause problems: no information breeds anxiety, and total information can become a way of monitoring.
• Time. How many nights, which nights, and what is protected. The most underrated agreement and the one that quietly ends more connections than anything else.
• Sexual health. Testing frequency, protection with new partners, and what happens if something changes. This is not optional and is best settled explicitly.
• People who are off limits. Close friends, colleagues, family members of either partner, exes. Reasonable and worth naming early.
• Home. Whether other people come to a shared home, and whether a shared bed is included.
• Meeting. Whether partners meet each other's partners, and whether that is expected or optional.
• Ending. What happens if one of you wants to close the relationship again, which is the agreement almost nobody makes and many later wish they had.

Rules that reliably fail

Some popular rules are popular precisely because they sound safe, and they have a poor record.

• No falling in love. You cannot instruct someone's feelings. What this rule actually produces is a partner who has feelings and now also has a reason to hide them, which is worse than the thing it was meant to prevent.
• Only once with the same person. Intended to prevent attachment, and it mostly guarantees a series of encounters with strangers, which many couples find harder rather than easier.
• No one I know. Sensible on the surface, and in practice it pushes everything toward people neither of you can vouch for, which reduces safety rather than increasing it.
• Everything gets shared immediately. Sounds like transparency. Frequently becomes surveillance, and it also overrides the reasonable privacy of the third person, who did not agree to have their evening reported in detail.
• Equal numbers. Attempts to solve unfairness with arithmetic. Attention and time are not fungible, and keeping score reliably makes both people miserable.

The third person is not covered by your agreement

This is the point most commonly missed by couples writing rules, and it causes a disproportionate amount of harm.

You and your partner can agree anything you like about your own behaviour. You cannot agree anything about a third person, because they were not in the room. An agreement that a new partner will accept a veto, or will never stay overnight, or will remain secondary indefinitely, is not an agreement. It is a set of terms you will need to disclose to someone who is entitled to decide whether they accept them.

The functional version is simple: anything your agreement requires of someone else has to be told to them early and honestly, before they have invested anything. If a term is one you would rather not mention until later, that instinct is telling you something about the term.

Write agreements that can be revised

The most useful thing experienced people say about this is that an agreement is a description of what you currently think will work, not a contract. It should be revisited, and the expectation that it will be revisited should be part of it from the start.

A useful habit is a scheduled conversation, monthly at first, about whether the current arrangement is still right. Doing it on a schedule rather than in response to a problem matters more than it sounds, because it means renegotiation is not automatically a crisis. Couples who only discuss the terms when something has gone wrong end up with agreements that can only be changed under duress.

What to do when a rule gets broken

It will happen, and how it is handled matters more than the breach usually does. The distinction worth drawing is between a rule that was broken and a rule that was outgrown.

Someone who deliberately concealed something has damaged trust and that is a serious matter. Someone who found that an agreement no longer matched reality and said so, awkwardly and late, has mostly demonstrated that the agreement needed changing. Treating both the same way teaches your partner that honesty and dishonesty carry identical costs, which is exactly the wrong lesson to teach.

If you have not yet had the initial conversation, raising it with your partner covers that. If jealousy is the thing making agreements hard to hold, jealousy and what to do with it is the more useful starting point.