Noun
Monogamy is a relationship structure where two people form a mutual, exclusive partnership with only one romantic, sexual, or marital partner at any given time.
What Monogamy Means
The definition of monogamy is a relationship arrangement in which a person has one partner at a time, typically with an agreement to be romantically and sexually exclusive.
Key Types of Monogamy
- Social Monogamy means: A relationship arrangement in which two partners share a home, pool resources, or work together to raise children. This pattern occurs in human communities and various animal species, including birds.
- Sexual Monogamy: A relationship in which partners agree to limit their sexual activity to one another, without sexual involvement with other people.
- Marital Monogamy: A marriage structure in which a person is married to only one individual at a time.
- Genetic Monogamy: A biological concept describing a pairing in which both parents of the offspring are the two individuals in the pair. In humans and other animals, genetic testing may reveal whether offspring are biologically related to both partners.
Monogamous Relationship Meaning Through History
What exactly a monogamous relationship means has changed through history.
The biggest shift in the general monogamy definition is that, in many societies, the accepted union between two people (or marriage) has moved from an arrangement shaped by property, inheritance, religion, and family obligations toward a relationship based on personal choice, affection, and agreed exclusivity.
That change hasn’t happened everywhere else in culture the same way.
In early human societies, there was no single universal relationship system. Human communities have practiced pair bonding, monogamous relationships, as well as polygyny — one man with multiple wives — and, less commonly, polyandry — one woman with multiple husbands. We can’t confidently describe prehistoric humans as exclusively monogamous or nonmonogamous.
Progressing to ancient civilizations, marriage often helped establish legitimate heirs, organize households, and form alliances. Ancient Greece and Rome generally recognized one legal wife at a time, but that didn’t necessarily mean sexual exclusivity in the sense of an accepted meaning of monogamy. Men could have socially tolerated relationships outside marriage, while women often faced much stricter restrictions. Other societies permitted multiple wives, particularly among wealthy or powerful men.
Over centuries, Christian institutions strengthened the ideal of marriage between one man and one woman, condemning sex outside marriage as a core value of the Bible. In medieval Western Christianity, marriage became established as a sacrament.
Marriage continued to serve economic and family interests as culture grew. The Protestant Reformation changed how some Europeans understood marriage, treating it as a religiously significant institution governed through civil authority rather than a sacrament.
In the eighteenth and nineteenth centuries, in parts of Europe and North America, choosing a spouse for love became increasingly important. “Companionate marriage” — the idea that spouses should share affection, friendship, and a life — gained influence, although money, class, and family approval still mattered.
The twentieth century saw greater independence for women; contraception and changing divorce laws helped make marriage and sexual relationships more matters of individual choice. Expectations of mutual fidelity became more explicit, challenging older double standards. Divorce and remarriage also made serial monogamous relationships more visible: several exclusive partnerships over a lifetime.
Where The Word Monogamy Comes From
This term comes from the Greek monogamía, meaning marriage to one person. It combines monos, meaning “single” or “alone,” with gamos, meaning “marriage.”
Its literal meaning is “one marriage.”
FAQS About Modern Monogamy
Here are common terms used when discussing monogamous relationships:
- Monogamous relationship: A partnership in which two people agree to romantic and sexual exclusivity.
- Sexual monogamy: Having sexual contact with only one partner.
- Romantic monogamy: Having only one romantic partner. Some people agree to romantic exclusivity while allowing sexual contact with others.
- Serial monogamy: Having successive exclusive relationships, with each ending before the next begins.
- Social monogamy: Forming a recognized couple or shared household; the term doesn’t necessarily imply sexual exclusivity.
- Monogamish: An informal term for a mostly monogamous relationship that allows certain agreed exceptions, usually involving sexual activity.
- Mutual exclusivity: An agreement that both partners will date or have romantic or sexual relationships only with each other.
- The exclusivity talk, or “DTR”: A conversation to “define the relationship,” including whether partners are exclusive and what that means.
- Emotional infidelity: An outside emotional connection that violates a couple’s relationship agreements. What counts varies between couples.
- Consensual nonmonogamy: An umbrella term for relationships that permit multiple sexual or romantic partners with everyone’s knowledge and consent; examples include open relationships, swinging, and polyamory.
These labels describe different aspects of sexual/partnered relationships, some skirting around this time-honored definition, with others taking on a revised meaning of the term.
What Is Monogamy In The Present Day
The distinction running through this history is that having one legally recognized spouse has never automatically meant having only one sexual partner. Modern monogamy often combines legal or social partnership with an expectation of mutual romantic and sexual exclusivity.


