Polyamory vs Polygamy: What Is the Difference?
Polyamory vs polygamy comes down to one word: marriage. Polygamy means being married to more than one spouse at the same time, a marriage form shaped by law, religion or tradition. Polyamory means having more than one loving relationship with the knowledge and consent of everyone involved, in any mix of genders, and most of the time it has nothing to do with weddings.
The two get confused at dinner tables and in comment sections, because the words look alike and both involve more than two people. Here is the plain version: what each word means, what the law says, how both compare with open relationships and swinging, and what to say when a relative asks whether you are planning a second wedding.
What the words actually mean
Both words start with the Greek "poly", meaning many. Then they part ways.
- Polygamy adds the Greek "gamos", marriage. Many marriages.
- Polyamory adds the Latin "amor", love. Many loves. Yes, it mixes Greek and Latin. Language purists have never quite forgiven it.
So polygamy describes a structure: who is married to whom. Polyamory describes a way of relating: several relationships, everyone in the know, everyone agreeing. A polyamorous person might be married to one partner, married to nobody, or living with two people and married to neither. Our longer guide to what polyamory means covers how it looks in ordinary homes.
A quick test works in almost every case. Ask: is anyone married to more than one person? If yes, you are talking about polygamy. If no, but there is more than one loving relationship and nobody is being deceived, you are talking about polyamory.
Polyamory vs polygamy vs polyandry
Polygamy is the umbrella word. Under it sit two forms:
- Polygyny: one husband with several wives. Where polygamy is legal today, this is mostly what it means.
- Polyandry: one wife with several husbands. Far less common.
The shape matters. In polygyny the right to add a spouse usually belongs to one person, the husband. The wives are married to him, not to each other, and they do not take other husbands.
Polyamory has no built-in direction. A woman can have two boyfriends. A man can have a wife and a girlfriend, and the girlfriend can be dating a woman of her own. Three people can all be together, which is what people mean by a throuple. A wider web of linked relationships gets called a polycule. The default idea is simple: the freedom you take, your partners can take too, unless everyone has agreed something else.
For many families around the world, polygamy is a sincere religious or cultural practice, and those families deserve the same respect as anyone else. The point here is not to rank anybody. The two words describe different things, and lumping them together confuses everyone, including the people who live either one.
Polygamy vs bigamy, and what the law says
This is general information, not legal advice. Laws change, and your own situation is worth checking with a lawyer where you live.
Bigamy is the legal act: marrying a second spouse while you are still married to the first. It is illegal across the US, Canada, the UK and the EU. Polygamy is the wider word for having several spouses. Put simply, bigamy is what the law calls an attempt at polygamy in a place where polygamy is not allowed.
What is not illegal in those places is the thing polyamorous people actually do: having relationships with more than one consenting adult. Nobody needs permission to date two people or to share a home with them.
A few details people often ask about:
- Utah reduced bigamy among consenting adults to an infraction in 2020. It is still an offence, just a far smaller one.
- Somerville and Cambridge, in Massachusetts, recognised domestic partnerships of more than two people in 2020 and 2021. These are local partnerships, not marriages.
- Elsewhere, polygamy is legal in some countries, mostly as polygyny.
So a polyamorous person in Toronto, Leeds or Lyon can marry one partner in the ordinary way and love another openly. What they cannot do is marry the second one too. Some hold a private commitment ceremony instead, with no legal effect, and that is their own business.
Polyamory vs polygamy, side by side
- What defines it. Polygamy: more than one spouse. Polyamory: more than one loving relationship.
- Marriage. Polygamy: required. Polyamory: optional, and limited to one spouse in North America and Europe.
- Who may add partners. Polygamy: usually the husband. Polyamory: anyone, by agreement.
- Genders. Polygamy: mostly one man and several women. Polyamory: any combination at all.
- What holds it together. Polygamy: marriage, often with religious and family roles. Polyamory: consent that keeps being renewed, and a lot of conversation.
- The law in the US, Canada, the UK and the EU. Polygamy: a second marriage is not allowed. Polyamory: the relationships are legal, the extra marriage simply is not available.
Polyamory vs open relationship vs swinging
These three get mixed up nearly as often as the first two.
- Polyamory means more than one relationship with feelings: dates, anniversaries, sometimes a shared home. Love is on the table.
- An open relationship usually means a couple who stay each other's main partner and agree that sex or dating with others is allowed. The emotional centre stays with the couple.
- Swinging usually means a couple who enjoy sex with other people together, often with friends or at private parties, while romance stays at home.
Real life blurs the lines. Plenty of swinging couples have close friends they adore, and plenty of poly people mostly enjoy the social side. Some people even come to feel glad, rather than threatened, when a partner is happy with someone else, a feeling called compersion. A label is the start of a conversation, not a contract.
Notice what none of these need: a court, a certificate or a ceremony. They live in friendships and in private evenings among people who trust each other. That is also where most people learn to do them well, by meeting others who already live this way, not by reading definitions.
How to explain the difference to family
Most families do not need a lecture. They need one sentence they can repeat, and some sign that you are fine. Try one of these:
- "Polygamy is about being married to several people. We're not marrying anyone else. We just don't lie about having more than one relationship."
- "It's not a marriage thing, it's an honesty thing. Everyone knows, and everyone agreed."
- To a parent who is worried for you: "Nobody is pressuring me. I get the same say as everyone else, and I can change my mind."
We see this a lot with couples who are new to our community: the hardest talk is rarely the one with each other. It is the one with a parent who has seen a single television show about polygamy and filled in the rest.
It helps to have at least a few friends you can say all of this to without explaining yourself first. Then the family conversation is one talk among many, not the only place your life gets discussed.
Common mistakes when you explain it
- Over-explaining. Ten minutes of vocabulary sounds defensive. Give the one-liner, then let them ask.
- Putting down polygamy to make yourself look better. It starts an argument you do not need, and it is unkind to people whose faith includes it.
- Choosing a big family meal. Pick one person and a quiet moment. Let them pass it on if you want it passed on.
- Expecting instant understanding. Relatives often need weeks. Worry, and even a little envy or jealousy, can show up in them too. Both usually soften once they see you are happy.
What is cowboying in polyamory?
Cowboying, or cowgirling, is when a monogamous person dates someone polyamorous with the quiet plan of roping them away from their other partners and into a closed couple. The name comes from the lasso.
It tends to end badly because it starts with a hidden agenda, the exact opposite of what polyamory runs on. If you want monogamy, say so early. "I'm monogamous, and I'd want that eventually" is a kind, honest sentence. So is "I'm poly, and I'm not looking to change that."
Hidden agendas are also why the poly and swinging circles that last tend to run on the same ground rules: consent from everyone, an equal say, and no money changing hands, so nobody is there for any reason except wanting to be.
What is solopoly?
Solo polyamory means having more than one relationship while staying, in effect, your own main partner. A solo poly person may not live with anyone, may not want to merge money or plan a life around one person, and still has real, caring, long-running relationships. It is about independence, not a lack of feeling.
Do poly couples sleep in the same bed?
Some do, some do not, and there is no rule. Partners who live together, often called nesting partners, may share a bed most nights and use the spare room when one of them has a date staying over. Others keep separate bedrooms as a matter of course, because sleep and privacy matter. Three people in one bed every night is rarer than films suggest, mostly for reasons involving elbows.
Where the difference really shows
Polygamy is settled on paper. Polyamory, open relationships and swinging are settled in conversation, again and again, among people who choose each other. Reading gets you the vocabulary. Sitting across a table from people who already live it gets you everything else. Whether you call yourselves poly, open, swingers or simply curious, you are welcome to join Rope & Candy, a free, invite-only circle of open-minded couples and single women in North America and Europe. Joining takes one email, and when someone from our team is in your city, we meet you for a coffee or a dinner. No second wedding required.
Questions people ask
Is polyamory a form of polygamy?
No. Polygamy is a form of marriage with more than one spouse. Polyamory is a way of having several loving relationships with everyone's consent, and it does not involve extra marriages.
Is polygamy legal in the US, Canada, the UK or the EU?
No. Marrying a second spouse while you are still married is bigamy, and it is illegal across all of them. Relationships between consenting adults are not illegal. This is general information, not legal advice.
Can polyamorous people get married?
Yes, to one person at a time, in the ordinary way. Some also mark a second relationship with a ceremony of their own, which carries no legal weight but can mean a great deal to the people in it.
What is the difference between polygyny and polyandry?
Polygyny is one husband with several wives. Polyandry is one wife with several husbands, and it is far less common. Both are forms of polygamy, so both are about marriage.