An open relationship is one in which the people involved agree that sexual experiences —and, depending on their agreement, dates or ongoing connections— may take place with others. It is not the same as cheating because the opening is known and accepted, and it does not mean that anything goes. Its wellbeing depends less on the label than on freedom of choice, clear agreements and the ability to review them.
The idea of opening a relationship may feel exciting to one partner and frightening to the other. Sometimes it begins as shared curiosity; sometimes it emerges after a crisis, an affair or a difference in sexual desire. The same phrase can describe very different arrangements.
This guide explains what an open relationship means, how it differs from polyamory, what to discuss before taking a step and how to recognise genuine consent. It is not an argument for opening a relationship. Monogamy can be healthy and so can non-monogamy when the structure is freely chosen and compatible with the needs of those living it.
What is an open relationship?
Broadly, an open relationship retains an established couple relationship whilst allowing certain experiences with other people. The opening most often concerns sex, but there is no single practical definition. Some couples agree to occasional encounters; others allow repeat dates, friendship, overnight stays or a degree of emotional closeness.
So saying “we are open” communicates less than it may appear to. You still need to know what open means to each person, what remains exclusive, which information will be shared and how people outside the original couple will be treated.
An agreed opening is one form of consensual non-monogamy. Cheating means concealing or breaching what was agreed. Infidelity can therefore occur in an open relationship if someone lies, crosses a boundary or withholds information they had agreed to share.
Open relationships, polyamory and swinging are not the same
Open relationship
Usually retains a central couple and permits sexual experiences elsewhere. Continuity, emotional intimacy and disclosure vary according to the agreement.
Polyamory
Makes room for more than one known and consensual emotional or romantic relationship. Not everyone needs to date one another. Read our guide to polyamory and relationship agreements.
Swinging
Usually focuses on shared sexual experiences or exchanges with other couples in agreed settings. See our forthcoming guide to swinging relationships.
Hybrid arrangements
Some relationships permit only particular practices, situations or people; others evolve over time. A label never replaces specific conversations.
These categories overlap. A couple may begin with occasional sexual encounters and find that affection develops; another may decide that repeated dates sit outside their agreement. Feelings do not obey a contract, so it helps to discuss not only what will happen, but how you will respond when reality differs from the plan.
Can an open relationship work?
Available research does not show that one structure is universally superior. A 2026 meta-analysis combined 35 studies with 24,489 participants and found no overall difference in relationship or sexual satisfaction between monogamous and non-monogamous people. This does not mean every model suits everyone. It means that being open does not by itself doom or protect a relationship.
One study comparing different consensually non-monogamous styles reported poorer average outcomes among people in open relationships than among polyamorous or swinging groups. Crucially, those differences disappeared after accounting for variables including communication, motivations for opening, certain beliefs and contact with partners’ other partners. The finding points towards relational processes rather than a simple ranking of labels.
Much of the evidence is cross-sectional, relies on convenience samples and comes from North America. It cannot predict what will happen to a particular couple or prove cause and effect. Research can challenge stereotypes, but it cannot promise that “good communication” will make an incompatible arrangement work.
Why do some couples consider opening their relationship?
Motivations can include sexual curiosity, autonomy, exploring orientation or fantasies, different erotic interests, sharing experiences, or living consistently with one’s understanding of relationships. None is automatically healthy or unhealthy.
The more useful clinical question is not only why, but from what position the decision is being made. Mutually desired exploration is different from opening to prevent a break-up, avoid an underlying problem, keep a partner who already has another relationship, or repair an affair without processing its impact.
Opening rarely repairs poor communication, insecurity or serious conflict by itself. It adds decisions, emotions and coordination. If a relationship is in crisis, it may be wiser to understand what is happening first and decide from a less urgent position.
Before opening: five essential conversations
What is each person hoping for?
Name expectations without presenting opening as a cure. Are you considering occasional sex, dates, shared experiences, autonomy or something not yet clear? Include what each person fears losing.
What would a freely given “yes” look like?
Check whether there is genuine room to say no, ask for time or suggest another option. Agreeing because you fear your partner will leave is not the same as wanting to participate.
What will remain exclusive?
This might involve particular practices, spaces, rituals, nights, intimate information or shared projects. Do not assume you attach the same meaning to exclusivity.
How will other people be treated?
Someone outside the couple is not a tool for solving an internal need. They deserve sufficient information, consent, respect, privacy and the ability to state their own boundaries.
How will you review the experience?
Agree when to talk, which signs call for a pause and how to disclose a mistake. Reviewing is not surveillance; it turns experience into useful information.
Which open-relationship agreements should you discuss?
There is no universal list, but these areas prevent many misunderstandings:
People and contexts
Are there concerns involving friends, colleagues, former partners or shared spaces? A boundary should not classify other people as less worthy of consideration.
Sexual practices and health
Discuss barriers, STI testing, contraception, vaccination, how changes will be communicated and which levels of risk each person accepts.
Information and privacy
Do you want to know beforehand, afterwards or only what affects health and agreements? Transparency does not justify sharing another person’s intimate details without permission.
Time and spaces
Consider rest, responsibilities, parenting, couple time and the home. A calendar is not merely administrative; it reflects priorities and care.
Affection and continuity
What if love, attachment or a recurring relationship develops? You cannot prohibit a feeling, but you can agree how to communicate and respond.
Mistakes and repair
Distinguish an accident, an ambiguity and deliberate concealment. Decide how to disclose it, which care steps follow and when a pause is needed.
The number of relationships does not determine how carefully someone behaves. Useful protection may combine barriers where appropriate, testing based on practices and exposure, recommended vaccination, contraception where pregnancy is possible, and prompt communication about changes. A healthcare professional can help tailor these decisions.
Boundary, request and agreement: three different ideas
- Personal boundary: what I need in order to participate or protect myself. For example, “I do not want sex without a barrier if our exposure has changed and we have not discussed it”.
- Request: something that would help me, whilst recognising the other person can answer. For example, “I would appreciate some time to reconnect tomorrow”.
- Agreement: a commitment accepted by those involved. For example, “We will disclose any change relevant to sexual health before our next sexual contact”.
A rule may sometimes try to control what someone else can feel or do, even outside our presence. Behavioural agreements are often necessary, but ask: does this protect a genuine need, could all affected people participate, is it realistic, and what happens if it stops working?
Jealousy and insecurity: what can help?
Jealousy does not prove that opening was a mistake, just as jealousy in monogamy does not invalidate monogamy. It may combine fear of loss, comparison, perceived unfairness, insufficient information, attachment needs, shame or anger about a breached agreement.
- What fact occurred, and which interpretation am I adding?
- Am I afraid of losing time, affection, priority, safety or recognition?
- Was an agreement breached, or am I feeling something difficult within what we agreed?
- What can I regulate myself, and what reasonable support would I like to request?
- Do we need comfort, information, renegotiation or a temporary pause?
Compersion —pleasure in a partner’s positive romantic or sexual experience with someone else— may occur, but it is not compulsory and it is not a test of maturity. A more realistic aim is to recognise feelings, avoid punishment and seek responses consistent with everyone’s dignity.
Caring for the couple without imposing a rigid hierarchy
Caring for the established relationship need not mean treating everyone else as secondary or disposable. It means meeting responsibilities, protecting quality time, communicating change and noticing when novelty consumes all available resources.
Meaningful rituals may help —a weekly conversation, a regular meal or screen-free intimacy— as can distinguishing reconnection from checking. “How are you, and what do you need?” builds more security than an interrogation designed to reduce anxiety for a few minutes.
Security does not mean promising that nothing will ever change. Opening a relationship can alter identities, wishes and priorities. A more honest commitment is: “If something important changes, I will try to tell you clearly and involve you in decisions that affect us”.
Common mistakes when opening a relationship
- Starting under pressure: agreeing to prevent a break-up or because the opening is already happening in practice.
- Using it to treat a crisis: adding complexity without addressing resentment, disconnection or a previous affair.
- Writing dozens of impossible rules: trying to control feelings and situations that cannot be predicted.
- Ignoring other people’s wellbeing: withholding information, demanding one-sided availability or discarding someone when the couple feels afraid.
- Confusing privacy with secrecy: privacy protects intimacy; secrecy conceals information relevant to consent or agreements.
- Moving faster than you can process: accumulating experiences without time to integrate feelings, repair errors and rest.
What if one partner wants to open and the other does not?
No one is entitled to impose openness, and no one must remain in a relationship structure they do not want. It is also unrealistic to demand that someone never express an important need again. The task is to talk without turning the discussion into a vote someone has to lose.
You can explore what opening represents, what the objection protects and whether compatible alternatives exist. Sometimes both people choose a workable agreement. Sometimes a painful incompatibility becomes clear. Therapy may support a thoughtful decision, but should never be used to persuade the reluctant partner.
- someone threatens to leave, ridicule or punish in order to obtain agreement;
- an existing outside relationship is presented as something that must now be accepted retrospectively;
- financial dependence, fear or a power difference is used as pressure;
- the person cannot ask for time, withdraw consent or express discomfort without retaliation.
If this is your situation, our focused guide may help: “My partner wants an open relationship and I don’t”.
When can therapy help?
Relationship-diversity-affirming therapy does not assume that monogamy is healthier or that non-monogamy is more evolved. It helps you examine consent, motivations, attachment, communication, sexuality, power, agreements and compatibility without imposing an outcome.
It can be helpful before opening, after a broken agreement, when jealousy blocks communication, if one person feels pressured or when you cannot decide whether to continue. It may also help a couple close the relationship again when that choice is shared; closing should not become an automatic punishment for a difficult feeling.
Related guides
Frequently asked questions about open relationships
Is an open relationship the same as cheating?
No. A consensual opening is known and agreed. Cheating means concealing or breaching what was agreed. Someone can therefore cheat within an open relationship by breaking its agreements.
Can people in an open relationship fall in love with someone else?
It depends what the agreement allows, but no agreement can guarantee that a feeling will not develop. It is wiser to discuss how you would communicate and respond to that possibility than to rely solely on prohibition.
Does jealousy mean I am not suited to an open relationship?
No. Jealousy can occur in every structure. What matters is understanding what it signals, regulating it without control or punishment, and deciding whether your needs for security can be met within that arrangement.
Do partners have to disclose everything?
Not necessarily. Information relevant to consent, health and agreements should be shared whilst protecting other people’s privacy. The couple needs to decide what they need to know and why.
Can a relationship be opened for a trial period?
Yes, if both people freely choose it and understand how it will be reviewed. Still, experiences and relationships have real effects and cannot always be undone when a trial period ends.
Do both partners need to start dating at the same time?
No. Fairness does not require simultaneity, but unequal opportunities may trigger insecurity or unfairness. Discuss expectations without turning openness into a competition.
Can an open couple return to monogamy?
Yes, through a shared and responsible decision. If other relationships now exist, they should not be ended abruptly as though those people do not matter; respectful conversations and endings will be needed.
When should we seek professional help?
When discussions become pressurised or blocked, there is a deep disagreement, agreements have been broken, jealousy causes intense distress or you need support to decide without harming one another. Therapy should respect relationship diversity.
A place to talk without judgement or pressure
At Ocnos Psychology Clinic, we can help you understand what the proposed opening means to each person, put fears into words, build workable agreements or recognise an incompatibility. The aim is not to open or close the relationship, but to make informed decisions and protect the dignity of everyone involved.
Scientific sources consulted
- Anderson, J. R. et al. (2026). Meta-analysis of 35 studies comparing relationship and sexual satisfaction in monogamous and non-monogamous relationships. Journal of Sex Research.
- Hangen, F. et al. (2020). Consent, comfort and communication as dimensions distinguishing different non-monogamous arrangements. Journal of Sex Research.
- Conley, T. D. and Piemonte, J. L. (2021). Differences among open relationships, polyamory and swinging and CNM-specific predictors of dyadic adjustment. Archives of Sexual Behavior.
- Mogilski, J. K. et al. (2026). International development of a measure of maintenance practices in consensually non-monogamous relationships. Archives of Sexual Behavior.
- Lehmiller, J. J. (2015). Sexual health and protective practices in monogamous and consensually non-monogamous relationships. Journal of Sexual Medicine.
- Schechinger, H. A. et al. (2018). Helpful and harmful therapy practices with consensually non-monogamous clients. Journal of Consulting and Clinical Psychology.
Clinical note: this article is for information and does not replace an individual psychological, medical or psychosexual assessment. If there is coercion, violence or fear of retaliation, prioritise safety and seek specialist support; call 112 in Spain if anyone is in immediate danger.
