Ethical Nonmonogamy: What Therapists Keep Getting Wrong

There is a particular kind of therapy session that nonmonogamous people dread. It is the session where they mention their relationship structure and watch the therapist's face shift — not into hostility, necessarily, but into something that looks like concern. A careful neutrality that isn't quite neutral. A question about whether they've always felt this way, or whether something happened, or whether their partner is okay with this.

The implication is clear: the nonmonogamy is the problem, or at least a symptom of one. The therapist is waiting for the moment when the client will realize this.

This is not affirming practice. It is mononormativity dressed up as clinical concern.

Ethical nonmonogamy (ENM) is an umbrella term for relationship structures in which all partners have knowledge of and consent to the possibility of multiple romantic or sexual connections. It includes open relationships, swinging, relationship anarchy, solo polyamory, hierarchical polyamory, kitchen table polyamory, and many other configurations.

The word ethical is doing real work here. It distinguishes consensual nonmonogamy from infidelity, which involves deception. ENM is not cheating with extra steps. It is a different relationship structure, built on different agreements.

Estimates of how many people practice some form of ENM range from 4% to 20% of the U.S. population, depending on how the question is asked and what counts. A 2016 study by Haupert et al. found that approximately one in five Americans had engaged in consensual nonmonogamy at some point in their lives. These are not rare clients.

The most common clinical misread of nonmonogamy is that it reflects avoidant attachment — a fear of intimacy, a way of keeping partners at arm's length, an inability to commit. This framework is applied selectively and without evidence. Clinicians do not typically hypothesize that a client's preference for monogamy reflects anxious attachment or enmeshment. The asymmetry reveals the assumption: monogamy is the default, and deviation from it requires explanation.

Research does not support the avoidant attachment hypothesis. Moors et al. (2014) found no significant differences in attachment style between monogamous and consensually nonmonogamous individuals. People in ENM relationships show the full range of attachment styles, just like everyone else.

The idea that nonmonogamy is a way of avoiding commitment misunderstands what commitment means in ENM contexts. Many nonmonogamous people are deeply committed to multiple partners — sometimes for decades. The commitment is real; it is just not structured around exclusivity. Exclusivity and commitment are not the same thing, even though monogamous culture treats them as synonymous.

Clinicians sometimes treat nonmonogamy as something a client is going through — a response to a difficult relationship, a period of exploration that will resolve into monogamy once the underlying issue is addressed. This is condescending in the same way that treating bisexuality as a phase is condescending. For many people, nonmonogamy is a stable orientation, not a transitional state.

Jealousy is real in nonmonogamous relationships. It is also real in monogamous ones. The clinical question is not whether jealousy exists but how the client relates to it and what it signals. In ENM communities, jealousy is often treated as information — a signal worth examining, not a verdict on the relationship structure. Many nonmonogamous people develop sophisticated practices for working with jealousy that monogamous people rarely need to develop explicitly.

Compersion is a term that originated in polyamorous communities to describe the feeling of joy or satisfaction at a partner's happiness with another person. It is sometimes described as the opposite of jealousy — not the absence of it, but a different emotional response to the same situation.

The fact that English had no word for this before nonmonogamous communities coined one is itself revealing. Monogamous culture does not have a framework for finding your partner's other connections a source of pleasure. ENM communities have developed one, because they needed to.

Compersion is not universal in ENM relationships and is not required. But its existence as a concept — and as a real emotional experience for many people — challenges the assumption that jealousy is the inevitable and only response to a partner's other connections.

For some people, nonmonogamy is a relationship orientation — a stable, enduring sense of how they want to structure their intimate life. For others, it is a chosen practice within a particular relationship. Both are valid. The clinical task is to understand which is true for this client, not to assume that the nonmonogamy is situational or temporary.

If a client comes in with anxiety, the clinical question is whether the anxiety is related to their relationship structure — and if so, how. It is not to assume that the relationship structure is causing the anxiety. A nonmonogamous client with anxiety is not anxious because of the nonmonogamy unless the client identifies that connection.

ENM is not one thing. An open relationship in which two nesting partners have outside sexual connections but no outside romantic ones is structurally different from a polycule in which three or more people are all romantically involved with each other. Relationship anarchy, which rejects hierarchies between relationships entirely, is different from hierarchical polyamory, which explicitly names a primary partnership. These distinctions matter for understanding what the client is navigating.

• Metamour: A partner's partner, with whom you are not romantically involved
• Nesting partner: A partner you live with
• Kitchen table polyamory: A style in which all partners know each other and socialize together
• Parallel polyamory: A style in which partners' other relationships remain separate
• Relationship anarchy: A philosophy that rejects hierarchies between relationships
• Solo polyamory: Maintaining multiple connections while prioritizing personal autonomy and not seeking a nesting partner
• Polycule: A network of people connected through romantic or sexual relationships

Affirming practice does not mean treating nonmonogamy as inherently superior or problem-free. ENM relationships have real challenges: scheduling, jealousy, communication load, navigating different attachment needs across multiple relationships, the labor of maintaining multiple connections. These are worth exploring clinically. The goal is to help the client navigate their actual relationship structure — not to validate it as perfect or to pathologize it as broken.

Mononormativity is the assumption that monogamy is the natural, default, or superior relationship structure — that it is what people want unless something has gone wrong. It is embedded in most clinical training, most therapeutic frameworks, and most of the research on relationships.

It shows up in the questions clinicians ask (or don't ask). It shows up in the assumption that a client's relationship is monogamous unless stated otherwise. It shows up in the way jealousy is treated as a problem to be solved rather than information to be understood. It shows up in the implicit goal of helping couples "work through" their nonmonogamy rather than helping them practice it well.

Clinicians who work with nonmonogamous clients need to examine their own mononormativity the same way they examine other forms of cultural bias. It is not neutral. It has clinical consequences.

Nonmonogamy is disproportionately represented in LGBTQ+ communities and in neurodivergent communities. For LGBTQ+ clients, nonmonogamy may be part of a broader rejection of heteronormative relationship scripts. For autistic clients, the explicit negotiation and communication that ENM requires may actually be more accessible than the implicit norms of monogamous relationships. For ADHD clients, the variety and novelty of multiple connections may be genuinely regulating.

These are not pathological reasons to be nonmonogamous. They are reasons that make sense given who these clients are.

Mx. Love C. Dialogos, LMFT · They/Them · Buddhist Chaplain

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