Monogamy

A relationship of two people committed to romantic and/or sexual exclusivity with each other. Monogamy is the dominant relationship structure across most Western cultures, though research increasingly shows it offers no automatic advantage in relationship quality over consensually non-monogamous alternatives.

Also known as Monogamous relationship, Exclusive relationship.

What monogamy actually covers

The word comes from Greek monos (one) + gamos (marriage), originally about having one spouse. In modern usage it's broader, covering any partnership committed to exclusivity.

There's more than one kind. Sexual monogamy means no outside sexual partners. Emotional monogamy means no romantic attachments outside the primary relationship, which may or may not track with sexual exclusivity. Social monogamy describes pairs that cohabit, share resources, and raise children together. Serial monogamy is the most common actual pattern in Western life: one exclusive relationship at a time, but a sequence of them rather than a single lifelong partnership. And then there's lifelong monogamy, which is what most cultural scripts point at but which is, statistically, the less common outcome.

For a long time, the assumption held that monogamous relationships were just more satisfying, healthier, more stable than the alternatives. A 2025 meta-analysis in the Journal of Sex Research by Joel Anderson and colleagues pooled 35 studies and 24,489 participants across multiple countries including the US, Canada, Australia, Portugal, and Italy, and found this isn't true. Across trust, commitment, intimacy, and both relationship and sexual satisfaction, monogamous and consensually non-monogamous relationships scored comparably. Their title said it plainly: "Countering the Monogamy-Superiority Myth."

This doesn't mean monogamy is worse. It means it's neither better nor worse on average. Which puts a lot of weight on whether you actually chose it.

Where people get it wrong

That monogamy is "natural." It's a common intuition, usually supported by a vague sense of biology. The research is messier. Rates of genetic monogamy in humans vary widely. A frequently cited review (Bellis et al. 2005) found a median extrapair paternity rate of around 3.7% across studies, implying genetic monogamy in roughly 96 to 98% of pairings, but with huge variation across cultures and samples. "Mostly but not universally" is closer to the biological picture than "natural."

That choosing monogamy after considering ENM is settling. It isn't. A reasoned preference for exclusivity is a preference. The act of having considered the alternative and chosen this one is what makes it a choice rather than a default.

That monogamy requires suppressing attraction to anyone else. It doesn't. Attraction to people outside your relationship is common, often involuntary, and not usually a threat. Monogamy asks what you do with the attraction, not whether you have it.

That monogamy is inherently more stable. The data doesn't support this. Monogamous relationships end, often for infidelity. Consensually non-monogamous ones also end, for their own reasons. The presence or absence of exclusivity isn't the predictor. Communication quality, attachment security, and alignment on shared values matter more than structure.

Related terms you'll see

• Serial monogamy

  One exclusive relationship at a time, across a lifetime of successive partnerships. The most common actual pattern in Western countries.

• Conscious monogamy

  Monogamy practiced as a deliberate agreement, with ongoing conversation about why, rather than as an unexamined default.

• Monogamish

  Largely exclusive with explicit, narrow permission for occasional outside encounters. Sits on the border between monogamy and open relationships.

• Mononormativity

  The cultural assumption that monogamy is the default and correct structure, and that non-monogamous arrangements are deviations that need explaining.

• Ethical non-monogamy

  The umbrella term for consensual non-monogamous structures. Often discussed as monogamy's counterpart.

Where to go next

The useful question isn't "should I be monogamous?" It's "if I am, is it because I thought about it, or because I didn't?" The behavior can be identical. The relationship underneath isn't. If you're in a monogamous relationship and haven't had the explicit conversation, have it. If you're evaluating whether monogamy fits you at all, the ethical non-monogamy page is a good counterpoint.

• Ethical non-monogamy

Frequently asked questions