Are humans naturally monogamous? (2024)

Asked by: Lois Aled, Vale of Glamorgan

Humans aren’t sexually monogamous in the sense that many birds are. Geese form lifelong couples and virtually never mate with anyone except their partner. We are termed ‘socially monogamous’ by biologists, which means that we usually live as couples, but the relationships aren’t permanent and some sex occurs outside the relationship.

There are three main explanations for why social monogamy evolved in humans, and biologists are still arguing which is the most important. It may be because human babies need a lot of looking after and stable couples can share the parenting burden. Or it could be because men want to stay close to prevent their partners from cheating. And it could also be a strategy that women evolved to discourage men from killing infants that they suspected were not theirs.

Monogamy in humans is beneficial because it increases the chances of raising offspring, but it is actually very rare in mammals – less than 10 per cent of mammal species are monogamous, compared with 90 per cent of bird species. Even in primates, where it is more common, only about a quarter of species are monogamous. Our early ape ancestors weren’t monogamous and the practice probably didn’t take off until hom*o erectus emerged, around 1.9 million years ago.

Subscribe to BBC Focus magazine for fascinating new Q&As every month and follow @sciencefocusQA on Twitter for your daily dose of fun science facts.

Are humans naturally monogamous? (2024)

FAQs

Are humans naturally monogamous? ›

Monogamy in the human species

Are human beings naturally monogamous? ›

Not many species are strictly monogamous, people might be more polygamous than you would think. Humans aren't sexually monogamous in the sense that many birds are. Geese form lifelong couples and virtually never mate with anyone except their partner.

Are we genetically monogamous? ›

While human patterns are distinct from genetic monogamy, defined as two individuals who only reproduce with one another, levels of extra pair paternity are relatively low compared to other socially monogamous species.

Is it realistic to be monogamous? ›

The answer is simple: being monogamous is not as realistic as everyone thinks. This isn't to say that monogamy isn't possible, but rather that it isn't likely in a relationship meant to last a lifetime.

Are humans the only animals that practice monogamy? ›

Scientists now estimate that only about three to five percent of the approximately 4,000+ mammal species on Earth practice any form of monogamy. Before the advent of DNA fingerprinting, scientists believed that about 90 percent of bird species were truly monogamous.

Are men biologically polygamous? ›

Polygamy is not the desire for more partners. Men are not naturally polygamous, neither is a woman. Everyone desires more. Interestingly, polygamy only does apply to the married — a bachelor(rette) or a person in a monogamous marriage can't be polygamous — if anything, you're promiscuous.

Is monogamy a human construct? ›

While some argue this is because monogamy is a natural human behavior, others suggest that the concept of relationship styles in general has been heavily influenced by society and its expectations as well as by history, culture, and religion.

Are humans serial monogamous? ›

A pair of humans may remain sexually exclusive, or monogamous, until the relationship has ended and then each may go on to form a new exclusive pairing with a different partner. This pattern of serial monogamy is common among people in Western cultures.

Are humans monogamous by evolution? ›

Humans didn't evolve to be monogamous. Throughout history, the vast, vast majority of human societies have been polygamous. Even in nominally “monogamous” societies, human behavior most definitely is not monogamous.

Why is genetic monogamy rare? ›

Abstract. In pair-living mammals, genetic monogamy is extremely rare. One possible reason is that in socially monogamous animals, mate choice can be severely constrained, increasing the risk of inbreeding or pairing with an incompatible or low-quality partner.

Is monogamy unnatural? ›

Monogamy does exist in nature, as, of course, do females who seek out multiple partners. But nature does seem to push things in the direction of polygyny on our branch of the evolutionary tree. Among mammals, just 9 percent of species are monogamous; among primates, just 29 percent are.

Were ancient humans monogamous? ›

By about 3.5 million years ago, however, the finger-length ratio indicated that hominids had shifted more toward monogamy. Our lineage never evolved to be strictly monogamous. But even in polygamous relationships, individual men and women formed long-term bonds — a far cry from the arrangement in chimpanzees.

Does true monogamy exist? ›

In various cultures around the world people are able to engage in lifelong monogamous relationships. There are cultures, even here in the United States, that allow for non-monogamous relationships, and people in those cultures can live quite happily in those contexts.

Are human females monogamous? ›

There is scientific biological and empirical evidence to support that women and men both desire multiple partners throughout their lives. Most animals are not monogamous. Women do not lack "feeling" as you put it. Women are as sexual beings.

When did the Bible switch to monogamy? ›

As Christianity emerged in the Roman Empire in the first centuries AD, it embraced monogamy and took it further, insisting that two people must reserve their bodies and desires for each other, marriage becoming 'an everlasting threesome with God'.

What animal is truly monogamous? ›

Hornbills are a socially monogamous bird species that usually only have one mate throughout their lives, much like the prairie vole.

Did humans used to be monogamous? ›

In other words, polygyny was pretty common thousands of years ago. But, scientists said recently, around 10,000 years ago, something changed. Ancient humans became more monogamous.

Can any man be monogamous? ›

Yes, absolutely. I've been monogamous for 38 years and counting. I think sexual fidelity is a matter of integrity. It has nothing to do with opportunity or frustration.

What animal is naturally monogamous? ›

These include a few bats, grey wolves, some primates, prairie voles and Eurasian beavers, among others. In birds, monogamy is far more common with some 90 per cent of species exhibiting social monogamy.

Top Articles
Latest Posts
Article information

Author: Rueben Jacobs

Last Updated:

Views: 6612

Rating: 4.7 / 5 (77 voted)

Reviews: 92% of readers found this page helpful

Author information

Name: Rueben Jacobs

Birthday: 1999-03-14

Address: 951 Caterina Walk, Schambergerside, CA 67667-0896

Phone: +6881806848632

Job: Internal Education Planner

Hobby: Candle making, Cabaret, Poi, Gambling, Rock climbing, Wood carving, Computer programming

Introduction: My name is Rueben Jacobs, I am a cooperative, beautiful, kind, comfortable, glamorous, open, magnificent person who loves writing and wants to share my knowledge and understanding with you.