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Polyamory & Non-Monogamy: The Basics and the Types
What ethical non-monogamy is, the common relationship styles, key terms, the skills that make it work, and the red flags to watch for.
What it is
Ethical (consensual) non-monogamy (ENM) is an umbrella term for relationships where everyone involved knows and agrees that people can have more than one romantic or intimate connection.
The key word is consent — of everyone involved, not just the people at the center.
Types of non-monogamy
Polyamory
Multiple loving, often long-term relationships.
Hierarchical poly
A "primary" or nesting partner relationship gets priority in time and decisions.
Non-hierarchical poly
No ranking; each relationship is shaped on its own terms.
Kitchen-table poly
Partners and metamours are friendly and comfortable spending time together.
Parallel poly
Partners know about each other but keep separate lives.
Solo poly
Multiple relationships without a primary partner or nesting goal — your own "primary" is you.
Relationship anarchy
No predefined rules or hierarchy; every connection is negotiated individually.
Polyfidelity
A closed group (triad, quad) that's exclusive within itself.
Open relationship
A couple that allows outside sexual or casual connections, usually without other romantic relationships.
Swinging
Couples connecting with other couples or people, usually together and recreationally.
Monogamish
Mostly monogamous, with occasional agreed exceptions.
Relationship Shapes (Structures)
Dots are people. Solid lines are relationships; dashed lines are metamours who aren't partners. Hollow dots are outside partners.
Triad (throuple)
Three people all in relationships with each other.
Works well when… Everyone has a real say and each pair has time of its own.
Watch out for… Avoid treating the newest person as a guest in a couple's relationship.
Closed triad
Exclusive within the three, with no outside partners — a form of polyfidelity.
Works well when… All three want the same level of exclusivity and talk openly about it.
Watch out for… Agree what happens if someone wants to open up or leave.
Open triad
The three are together, and one or more can also have outside partners by agreement.
Works well when… Agreements about outside partners are shaped by all three.
Watch out for… Rules that apply to only one member of the triad.
V (vee)
One person (the hinge) with two partners who aren't partners with each other; the two are metamours.
Works well when… The hinge communicates clearly and metamours are kept informed.
Watch out for… The hinge needs strong scheduling and fairness.
N
Four people in a chain: two linked couples connected through one relationship.
Works well when… Each couple respects the other's existing commitments.
Watch out for… Decisions in one couple ripple to people two steps away — keep them informed.
W
Five people: two hinges, each with two partners, sharing one partner between them.
Works well when… The shared partner's time and needs are planned for, not assumed.
Watch out for… The shared partner being stretched thin between two hinges.
Quad
Four people — two couples where everyone is connected, or where only cross-relationships exist. Can be closed or open.
Works well when… Everyone agrees which relationships exist and how time is shared.
Watch out for… Assuming everyone must date everyone — each link is its own choice.
Closed quad / closed group
Exclusive within the group (polyfidelity).
Works well when… Everyone wants exclusivity and safer-sex agreements are shared.
Watch out for… What happens if someone wants to open up or leave?
Open couple
Two partners who each may see others casually or romantically.
Works well when… Both partners want it and agreements are revisited regularly.
Watch out for… One partner pressured into opening up.
Polycule
The whole network of connected partners and metamours, any shape.
Works well when… Communication flows to the people each decision affects.
Watch out for… Losing track of how changes affect people you rarely see.
Constellation
Another word for a polycule, often used for larger or looser networks.
Works well when… People are comfortable with varied levels of closeness.
Watch out for… Safer-sex information getting lost across a large network.
Solo poly network
A solo poly person with several independent partners who may not know each other well.
Works well when… The solo person is clear with every partner about their autonomy.
Watch out for… Partners feeling like an afterthought — care for every relationship.
Shapes change over time — the right one is whatever everyone involved freely agrees to.
Common terms
- Metamour
- Your partner's partner.
- Compersion
- Feeling joy at a partner's happiness with someone else.
- NRE
- New relationship energy — the excitement at the start of a new connection.
- Nesting partner
- A partner you live with or share a home with.
- Throuple
- Another word for a triad: three people all in relationships with each other.
- Hinge
- The person connecting two partners who aren't involved with each other.
- Closed / open
- Closed: no new or outside partners. Open: outside partners are allowed by agreement.
- Polyfidelity
- A closed group that's exclusive within itself.
- Constellation
- Another word for a polycule, often used for larger or looser networks.
- V
- Three people where one (the hinge) dates two others who aren't involved with each other.
- Triad
- Three people who are all involved with each other.
- Quad
- Four people in a connected relationship structure.
- Polycule
- The whole network of connected partners and metamours.
- Veto
- An agreement letting one partner ask another to end a relationship. Controversial and easily misused.
- Agreements vs rules
- Agreements are shaped together by everyone they affect; rules are imposed on others. Agreements tend to be healthier.
Skills that make it work
- Honest, frequent communication.
- Agreements everyone helps shape, rather than rules imposed on others.
- Calendar and time management.
- Handling jealousy as information, not an emergency.
- Regular safer-sex conversations and STI testing.
- Checking in with metamours' needs too.
- Aftercare and care for every relationship, not just the newest one.
Red flags
- Hiding partners or lying ("don't tell my wife") — that's cheating, not poly.
- One partner pressured into opening up ("poly under duress").
- Vetoes used to control people.
- "Unicorn hunting" — couples seeking a third who must follow the couple's rules, with no say of their own.
- Rules that only restrict one partner or one gender.
- Treating new partners as disposable.
Poly + kink
Dynamics, collars and power exchange with multiple partners need clear agreements about who knows what, safer-sex boundaries and scheduling.
Decide together what each partner is told, what's private, and how collars or titles work across relationships.
Disclaimer: This guide is for educational purposes only and is not medical, legal, or professional advice. All activities require ongoing consent between adults.