A partnered relationship with agreed permission for some outside connections.
Back to the glossaryConsent & relationships
Open relationship
A relationship whose partners agree that defined sexual and/or romantic connections outside it are permitted.
Consent & relationships
In brief
A negotiated form of openness—not unrestricted access.
Open relationship is a broad everyday label rather than one standard arrangement. Some agreements permit outside sexual contact but reserve romantic commitment; others are more flexible. The content, disclosure and safer-sex terms must be learned from the people involved, not inferred from the label.
CNM commonly open to multiple loving or emotionally significant relationships.
Consensual sexual socialising often organised around couples and shared settings.
An agreement limiting disclosure; it differs from concealment that breaches an uninformed partner's expectations.
Define openness
Partners may discuss people, places, activities, overnights, emotional involvement, disclosure, barriers and testing. Vague permission can leave incompatible assumptions hidden.
The outside partner also needs accurate information relevant to their consent. Privacy does not justify deliberate deception about material health or relationship facts.
Agreement and autonomy
An open agreement is not permanent and cannot be forced to save a relationship. Reluctant compliance under threat of abandonment deserves attention to freedom and compatibility.
Each person can decline individual encounters. Being open does not turn availability into a relationship duty.
Jealousy and communication
Jealousy may signal fear, insecurity, unmet needs or a valued bond; it is not proof that openness has failed. Compersion is likewise optional.
Communication should address concrete needs without making one person responsible for eliminating every difficult emotion before others act.
Evidence limits
Studies often combine diverse open arrangements or recruit from CNM communities, limiting causal conclusions. Some within-CNM comparisons report differences, but selection and agreement quality may contribute.
Assess the functioning of the actual relationship: consent, honesty, safety, care and whether agreements remain workable.
Non-graphic examples
What the umbrella may include
- Partners permit outside dates but discuss overnight stays first.
- A couple agrees on barrier and testing practices.
- Someone tells a prospective partner the relationship is open.
- An agreement allows privacy without requiring false statements.
- Partners return to monogamy only through a new mutual decision.
Reviewed 30 August 2026
Keep exploring.
This detailed field note uses the best available evidence without treating one community sample as universal. Evidence limits and UK context are stated where relevant.
Prepared by The UK Kink Guide editorial team. Read the evidence and review methodology.
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