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Ethical non-monogamy explained

Different shapes, one shared rule: everyone involved knows, and everyone has agreed.

By the Olivia Raven editorial teamUpdated · 6 min read

In short

Ethical non-monogamy, also called consensual non-monogamy, means having more than one sexual or romantic relationship with the knowledge and agreement of everyone involved. It covers open relationships, swinging, polyamory and looser arrangements. What makes it ethical is informed, freely given agreement that can be revisited. This Olivia Raven guide explains the forms, the vocabulary and how to start honestly.

Key facts
Also calledConsensual non-monogamy (CNM)
Core ideaEveryone involved knows and agrees
Common formsOpen relationships, swinging, polyamory
Not the same asAn affair, which is kept secret
SupportA counsellor experienced with non-monogamy

"Ethical non-monogamy" (often shortened to ENM) is an umbrella term, not a single arrangement. Some people prefer "consensual non-monogamy" (CNM) because "ethical" can sound as if it's passing judgement. Both mean the same thing: relationships where more than two people are involved, sexually or romantically, and everyone knows.

What makes it ethical?

Non-monogamy is ethical when everyone involved knows about it, has agreed freely, and is told the truth. Those three things separate it from an affair:

  • Knowledge. Your partner knows the arrangement exists. Depending on what you've agreed, they may not know every detail, but they know.
  • Agreement. Everyone has said yes freely, without pressure, threats or "agree or I'll leave". A reluctant yes given to keep the peace isn't consent; it's a problem stored for later.
  • Honesty with the people you meet. Someone you date is entitled to know you have a partner and roughly what the arrangement is, so they can make their own choice.

Ethical doesn't mean painless. People still get jealous, hurt and confused. What it means is that those feelings are talked about rather than hidden.

How is it different from an affair?

The difference is consent: in ethical non-monogamy your partner knows and has agreed; in an affair they don't. Everything else follows from that.

Item Ethical non-monogamy An affair
Does the partner know? Yes No
Who sets the terms? Both partners, together One person, alone
Can it be renegotiated? Yes, openly, at any time Only once it's discovered or confessed
What the new person is told The truth about the arrangement Often not the whole truth
Sexual health Agreed openly, including testing Hard to discuss honestly

Olivia Raven doesn't judge people in either situation, but our relationship guides are written for arrangements where everyone knows.

The main forms

There's no official list, and couples blend these freely. These are the arrangements you'll see described most often.

Open relationship

An open relationship is one where a couple stays each other's main partner and agrees that one or both can have sex, or date, outside it. The focus is usually physical or casual rather than falling in love with someone else.

Swinging

Swinging means partners have sex with other people together, or at the same event, often with other couples. The emphasis is on shared experiences rather than separate dating. It's sometimes called "the lifestyle".

Polyamory

Polyamory means being open to more than one loving relationship at a time, with everyone's knowledge. Some polyamorous people have a main partner and others; some don't rank their relationships at all.

Monogamish

"Monogamish" describes a mostly monogamous couple who allow occasional exceptions, such as a kiss on a night out, a one-off together, or an agreed exception while one of you travels.

Don't ask, don't tell

Here both partners agree that outside encounters are allowed but not discussed. It can work for some couples, but it often leaves one person filling the silence with worst-case imaginings. If you choose it, agree what still has to be shared, such as safer-sex practices and anything that affects your health.

One-sided arrangements

Sometimes only one partner wants to see other people, and the other genuinely doesn't, for example because of low desire, disability, distance or simple preference. These can be fair if both have agreed, and both keep checking that they still do.

The vocabulary

You'll come across these words in conversations, books and profiles:

Term What it means
Primary / nesting partner The partner you share a home or main life with
Metamour Your partner's other partner
Compersion Feeling pleased that your partner is happy with someone else; the opposite of jealousy, and not compulsory
New relationship energy (NRE) The giddy rush of a new connection, which can make the existing partner feel overlooked
Veto An agreement that one partner can end the other's outside relationship; controversial, and worth discussing carefully
Hierarchy Ranking relationships, usually with a main couple first
Unicorn A single woman who dates a couple; a word some women find reductive, so use it with care
Kitchen-table Everyone involved is friendly enough to sit down together
Parallel Partners' other relationships are kept separate from each other
Fluid bonding Agreeing to stop using barriers such as condoms with a particular partner, usually after testing

Questions to ask yourselves before you choose

The label matters less than the answers to a few practical questions. Work through them separately first, then compare:

  1. Is this about sex, about emotional connection, or both?
  2. Do we want to do this together, separately, or a mix?
  3. How much do we each want to know, and when?
  4. What's off-limits, such as friends, colleagues, ex-partners or our home?
  5. How will we handle safer sex and testing? (See sexual health with more than one partner.)
  6. How much time can each of us give to other people without the relationship suffering?
  7. What will we do if one of us wants to pause or stop?

The guide to starting the conversation turns these into a step-by-step approach, including what to do if your partner says no. If you haven't yet raised the subject at all, talking to your partner about fantasies is a gentler first step.

Who it tends to suit, and who it doesn't

Non-monogamy tends to work best for couples who already talk well and trust each other; it rarely fixes a relationship that is struggling.

It's more likely to suit you if you can talk about awkward feelings without it becoming a row, you both want it rather than one of you agreeing to keep the other, and you have the time and energy for more than one connection.

Be cautious if you're hoping it will save the relationship, one of you is saying yes out of fear of losing the other, there's a recent betrayal that hasn't healed, or either of you is going through a crisis that needs your full attention.

Where it tends to go wrong

The common pitfalls are predictable, which means you can plan for them: one partner agreeing under pressure, rules so tight that someone breaks them, agreements that are never reviewed, new relationship energy crowding out the existing relationship, and jealousy treated as a character flaw instead of information. The guide to jealousy in open relationships is a good place to start on that.

If things aren't working, you can change the arrangement or close the relationship again. That's a choice, not a failure.

Where to get support

A counsellor who works with non-monogamous clients can help you talk it through without either of you being treated as the problem. Ask any counsellor directly whether they have experience with open relationships before you book.

Where Olivia Raven fits

Olivia Raven is a discreet dating site written for women first and for people exploring open relationships. Members describe themselves however they like, and that text isn't checked, so someone who calls themselves "ethically non-monogamous" may or may not have a partner who knows. Ask directly and early.

If you're the one with a partner, say so in your profile. As an example, a line like "I'm in a long-term relationship; my partner knows I'm here and we've agreed what's OK" tells people what they need without giving away who you are. Profiles are shared with partner sites in the same network, so read the privacy checklist for women before you set one up.

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Questions people ask

Is ethical non-monogamy just cheating with permission?

No. Cheating breaks an agreement and depends on secrecy. Ethical non-monogamy changes the agreement openly, with everyone's consent, and the people you meet are told the situation too. It can still hurt, but the hurt is talked about rather than discovered, and the agreement can be changed or ended at any point.

Do both partners have to see other people?

No. Some arrangements are lopsided by choice: one partner dates and the other doesn't want to, perhaps because of low desire, distance or simple preference. That can be fair if both have genuinely agreed, nobody feels they had to say yes, and you keep checking that the arrangement still works for each of you.

Is polyamory the same as an open relationship?

Not quite. An open relationship usually means a couple stays each other's main partner and allows sex or casual dating outside it. Polyamory means being open to more than one loving relationship at a time. Many people blend the two, so ask what someone means rather than assuming from the label.

Can we try it and go back?

Yes. Some couples try a form of non-monogamy and later return to monogamy, for all sorts of reasons. Closing a relationship again is a valid outcome, not a failure. Agreeing at the start that either of you can pause makes that conversation much easier if it comes.

How do I tell a date I'm in an open relationship?

Early and plainly, ideally before you meet. Say that you have a partner, that they know and agree, and roughly what the arrangement allows. The person you're talking to is entitled to make their own choice. Anyone who is put off has saved you both time.

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