People who want a non-monogamous relationship often ask where to say so without trapping a partner who wanted something else. Justin Lehmiller answered a version of that question on December 21, 2012, in Sex and Psychology's Sex Question Friday. The column is the prompt. Counts of how many people want non-monogamy, and who they are, belong on the research pages that actually report a sample. This page is the practical sequence: say the relationship shape early, say it in words a stranger can repeat back, and do not use a kink event as a place to reveal it after the other person has already treated the night as exclusive.
Say the structure before the attachment
- Name non-monogamy before sex, before "I love you," and before anyone moves in.
- Use plain words: what other partners are allowed, what is disclosed, and what is off the table.
- A kink event is a poor first disclosure if your date thought the night was exclusive.
- A couple does not get to shop for a third person who has not agreed to that role.
- A no from one person ends the search with that person. It does not transfer to their friends.
What you are actually offering
Non-monogamy is a set of permissions, not a personality. Before you look for a partner, write the permissions in sentences you could read aloud. Are other sexual partners allowed? Other romantic partners? Overnight stays? A shared home with someone else? How soon does a new partner get told that you have other partners? Who pays for dates, travel, and safer-sex supplies? What happens if someone gets pregnant, or if a partner wants to meet the children? If you cannot answer those, you do not yet have a relationship shape. You have a wish to keep your options open, and you should say that too, because "I don't know yet" is information the other person needs.
Distinguish the common shapes without turning them into a ranking. Swinging, in the way most clubs use the word, centers sex with other people and often keeps romance at home. An open relationship allows sex outside a primary pair, with rules you have to state. Polyamory, as people who use the word mean it, allows more than one romantic relationship, with disclosure rather than a secret. Monogamish, a label popularized in advice writing, usually means a monogamous couple with narrow, agreed exceptions. Solo polyamory means a person who wants multiple relationships and does not want a nesting partner or a primary who ranks the others. If you use one of these words, define it in the same conversation. People use them inconsistently. Your definition is the one you will be held to.
Also name what you will not do. Some people want non-monogamy and still refuse sex without barriers, overnight dates, sex in the shared home, or any contact with coworkers. Those limits are part of the offer. A partner who agrees to "open" and then meets a hidden ban on the thing they actually wanted has been negotiated with in bad faith. State the ban at the start.
When to say it
Say it on the first or second date, before sex, and before you have met their family. The reason is practical. Feelings make people accept terms they would have refused if they had heard them early, and then resent the terms. You are not protecting them by waiting until you are sure you like them. You are asking them to price a different relationship after they have already invested. If the news would change whether they want a second date, they deserve it before the second date.
If you already have a monogamous partner, you do not "find a non-monogamous partner" by dating in secret. You have a monogamous agreement. Changing it is a conversation that can end the relationship. Have that conversation clothed, sober, and not after you have already had sex with someone else. Opening a relationship in order to keep a person you already cheated with is a crisis, not a structure. The existing partner gets to refuse. If they refuse, your choices are monogamy with them or a breakup. Their friends, their sibling, and their coworker are not the backup search.
If you are single and dating, put the fact in the place where a stranger will see it before they spend a week messaging you. A profile line works: "I date more than one person, and I will tell you about other partners before we have sex." Repeat it out loud when you meet. A profile is easy to skim. Your mouth is harder to misunderstand. If they say they missed it, believe them and say it again. Then let them leave.
Where to look, and where not to
Use places that already sort for the relationship shape. Dating apps with a non-monogamy field, polyamory social groups, and munches where the invitation says the topic is relationships are built for this conversation. A personal ad that states the structure will get fewer replies than a vague one. The smaller set of replies is the point. You want the people who read the line and stayed.
A dungeon, a play party, or a hotel takeover is a bad first filter if you treat every guest as available for a relationship talk. People are there under a ticket and a code of conduct. Some are monogamous and attending with a partner to watch or to learn. Some are non-monogamous and not looking. Some will play once and never want your last name. Flirting can be welcome. Disclosing your relationship plans in the middle of a scene, or assuming a scene means they are open to dating, skips the step this article is about. Read the event rules. If you want a date, ask for a date on another day, in clothes, with the non-monogamy sentence included. Consent for a scene is not consent for a relationship. The party rules are in the play-party article.
Do not use a partner's social circle as a hunting ground after they said no. Do not ask their friends to keep a secret from them. Do not treat a bisexual woman's interest in you as agreement that she will also date your boyfriend. A couple seeking a third person owes that person a direct description: who the third dates, whether they can refuse one of you, whether they stay the night, whether this is a one-time sexual encounter or a bid to join the marriage, and what happens to them if the couple fights. Many people will refuse a couple because the structure is "you are here for us," not because they refuse non-monogamy. Accept the refusal. Do not rephrase the offer until they get tired.
What to ask before you attach
Ask about other partners in concrete terms. How many people are they dating now? Do those people know they are on this date? Is anyone married, and does the spouse know? Are there agreements you would be breaking by kissing them? You are allowed to want those answers before you are naked. Someone who calls the questions insecure is telling you they do not want to answer. You can end the date there.
Ask about sexual health the same way. When were you last tested, for which infections, and what barriers do you use with other people? Agree on condoms or other barriers before fluids are involved, and treat removal of a condom as a new act that needs a new yes. That rule is the same one used for group sex at parties. A non-monogamous relationship multiplies the number of people affected by a lie about barriers. The lie is the harm. The relationship label does not absorb it.
Ask about time and money. Non-monogamy fails in calendars more often than it fails in slogans. Which nights are available? Who gets holidays? If you have children, who is allowed around them, and after how many months? If one of you earns far more, does that person pay for the other partners' dates, and did anyone agree to that? Financial entanglement with a metamour, the partner of your partner, needs the same explicit yes as a scene. Do not start paying someone's rent and call it generosity.
Ask what disclosure they require. Some people want to hear about every date. Some want to hear only about sexual risk. Some want no details. Pick a rule you can keep on a bad day. A rule you will break the first time a date goes well is a rule you should not offer. If you already know you will hide things, say you are looking for a relationship where privacy between partners is the agreement, and let them refuse. Hiding inside a disclosure agreement is cheating with extra steps.
Jealousy is a scheduling and information problem first
Jealousy will show up even when everyone told the truth. Treat the first wave as data. What did you learn, and when? Was the other date in your home? Did a message arrive during a plan you had already made? You can change those conditions without accusing anyone of being too jealous to do non-monogamy. Research pages on this site discuss what studies have said about jealousy and satisfaction. Those pages should not be used to tell a partner their distress is scientifically outdated. A person who is miserable under the agreement gets to leave it. You do not get to cite a study at them until they comply.
A veto, a rule that one partner can order the other to end an outside relationship, needs to be agreed before anyone is in love with the outside person. Used late, it is a weapon. Used early, it is still a power you should describe in one sentence so the new person hears it: "My existing partner can require me to stop seeing you." Many people will decline to be the person who can be deleted by a stranger. That decline is reasonable. If you want hierarchical polyamory, say hierarchy. If you want the new person to have a full relationship, do not keep a silent veto.
When the search itself is the misconduct
Pressure is not a search tactic. Repeated asks after a no, messages to their friends, showing up at their event after they declined a date, and sexual contact during a scene they agreed to for a different reason are all boundary crossings. A kink community will sometimes mistake persistence for flirtation. The consent standard does not. One clear no closes the question. The habits that do and do not carry over from kink spaces are in what kink consent habits do not transfer.
If you are already non-monogamous and a new person wants monogamy with you, do not half-agree. "Maybe someday" while you keep other partners is a stall. Tell them the structure is current, not a phase you will age out of for them. Let them decide. If you are monogamous and curious, say curious. Do not build a shared lease on a curiosity you have not tried to discuss.
Finding a willing partner is mostly subtraction. You state the shape. You leave when the other person wanted a different one. You do not borrow their night, their friends, or their monogamous agreement in the hope they will catch up. The people who remain are the candidate pool. It is smaller than the room. That is the method.