Attachment theory

Also: attachment styles, secure attachment, attachment in polyamory

A framework describing how early bonds shape adult patterns of seeking and responding to closeness — secure, anxious, avoidant, disorganised — increasingly used in ENM to understand why some configurations feel safe and others don't.

1 min read · Reviewed 2026-05-24

Attachment theory describes the patterns people develop for managing closeness and separation: roughly, secure (comfortable with intimacy and autonomy), anxious (preoccupied with a partner's availability), avoidant (uncomfortable with too much closeness), and disorganised (a mix, often trauma-rooted). It originated in developmental psychology and was extended to adult romantic relationships, and it has become one of the most influential lenses in modern non-monogamy.

Its prominence in ENM is largely thanks to Jessica Fern's Polysecure, which applies attachment theory directly to consensual non-monogamy and argues that you can build secure attachment with more than one partner — but that doing so requires deliberate attention to the conditions that create felt security, because non-monogamy can activate attachment fears that monogamy's exclusivity papers over.

Practically, the framework helps explain reactions that otherwise look irrational: why an anxiously-attached person spirals when a partner is on a date, why an avoidant person pulls back as a relationship deepens, why certain agreements soothe and others inflame. It reframes those reactions as attachment needs to be worked with rather than character flaws — and offers a vocabulary partners can use to ask for what actually helps.

Where this term fits in the wider picture

Ethical non-monogamy is a network of overlapping practices, identities, and structures — and Attachment theory connects to several of them. The neighbouring terms below show how this one sits alongside the rest of the vocabulary practitioners actually use; the guide at the end is the longer-form treatment of the same territory.

Closely-related vocabulary

Polysecure
Both a book by Jessica Fern (2020) and a community shorthand for the practice of secure attachment in polyamorous relationships. Widely cited in ENM-affirming therapy.
Jealousy
The felt sense of threat or loss triggered by a partner's connection with someone else. In ENM it's treated not as a verdict but as a signal to be examined — usually pointing at an unmet need or an underlying insecurity.
Nesting partner
The partner you share a home with — used specifically to describe the cohabiting relationship without implying ranked hierarchy.
Anchor partner
A non-hierarchical term for a partner with deep practical entwinement — shared home, finances, decisions — without designating other relationships as lesser.
Wibble
A small spike of jealousy or insecurity — the polyamory community's term for a passing wobble that does not warrant restructuring anything, just acknowledging.

Questions practitioners actually ask about this

Continue reading

The longer treatment of this territory is in the guide Polyamory and attachment: building security with more than one partner — How attachment theory explains the emotional weather of polyamory — why non-monogamy activates old fears, and how to build felt security across multiple relationships.

New to ethical non-monogamy? Start with the glossary for vocabulary, the structures index for the named relationship configurations practitioners actually use, and the guides for longer-form treatment of the common questions.

Sources & further reading