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BrainHook Glossary

CNM

CNM is a relationship style where all partners agree to have multiple romantic or sexual connections, prioritizing open communication and consent over exclusivity.

CNM — BrainHook Glossary card

Consensual Non-Monogamy (CNM) refers to relationship structures where all partners openly agree to have multiple romantic or sexual connections. Unlike traditional monogamy, CNM prioritizes explicit communication and mutual consent rather than exclusivity. The term encompasses various forms, including open relationships, polyamory, and swinging, and is grounded in the principle that satisfaction can occur across multiple partnerships when boundaries are respected.

CNM

What this means in real life

A person might have a primary live-in partner and also date another person separately; all three know about each other, have discussed boundaries, and agree to the arrangement.

What it isn’t

It is not cheating or infidelity—the defining feature is that all partners know and consent. It is also not the same as an open relationship, which typically involves one committed couple allowing outside encounters rather than multiple ongoing romantic bonds.

Commonly misused online

Often conflated with polyamory as synonyms, though polyamory is broader (emotional + romantic focus) while CNM emphasizes the consensual multi-partner structure itself, which can be sexual, romantic, or both.