Part One: What Early Human Sexuality Really Looked Like
There are certain ideas so deeply embedded in a society that we stop questioning them.
One of those ideas is monogamy.
From childhood fairy tales to wedding vows, from church pews to Hollywood endings, we are taught that one man and one woman choosing one another, emotionally and sexually, for life is not only the ideal, but the natural human design.
But what if that isn’t entirely true?
What if monogamy, as we know it today, is less a biological blueprint and a more social structure built over time?
To understand that, we must go back, far before churches, marriage licenses, or even written language.
We have to go back to prehistory.
Before Civilization, There Were No Wedding Rings
For over 95% of human existence, our ancestors lived not in cities or neighborhoods, but in small roaming bands of hunter-gatherers.
These groups were typically made up of 20 to 50 people and survival was a daily collaboration:
finding food, protecting children, maintaining shelter, and defending against threats.
There were no formal marriage ceremonies.
No legal contracts.
No institutionalized church teachings on sexual behavior.
Human relationships formed under one guiding principle: survival.
And survival required adaptability.
Humans Were Not Built for One Rigid Mating System
Anthropologists often use the term flexible mating behavior when discussing early human sexuality.
This simply means humans were not biologically locked into one exclusive pattern of sexual partnership.
Unlike species that mate for life, humans show evidence of something far more nuanced:
the ability to form deep pair bonds while still maintaining sexual flexibility.
In practical terms, this likely meant:
- men and women often formed primary attachments,
- those attachments helped provide stability for raising offspring,
- but lifelong sexual exclusivity was not necessarily the universal expectation.
Partnerships could shift.
New bonds could form.
Relationships were shaped as much by environmental need as by emotional attachment.
Humans, in essence, evolved with the capacity for commitment—but not the strict requirement of permanence.
Pair Bonding and Sexual Variety Coexisted
This is where many people become uncomfortable, because we often think in absolutes:
either humans were monogamous… or they were promiscuous.
Prehistoric life was likely neither.
Early humans appear to have balanced two biological drives:
The drive for pair bonding
A bonded male and female increased the survival chances of their children. Human infants require years of care, making cooperation advantageous.
The drive for reproductive opportunity
Sexual attraction outside of a primary bond likely still existed, creating genetic diversity and additional mating opportunities.
These two drives are not contradictory.
They are both deeply human.
And they still exist in us today.
That means the tension many modern couples feel between emotional loyalty and sexual curiosity may not be evidence of moral failure at all…
…it may simply be evidence of inherited biology.
Children Were Raised by More Than Two People
Another modern assumption is that the “nuclear family” is humanity’s oldest social unit.
It isn’t.
In prehistoric bands, children were often raised within a cooperative social structure:
parents, siblings, grandparents, and other group members all contributed to protection and care.
Anthropologists call this alloparenting.
Because child survival did not rest solely on one man and one woman functioning as an isolated household, the pressure for rigid lifelong exclusivity was significantly reduced.
Family was communal before it was private.
This changes the lens entirely.
The relationship model many now consider “traditional” is, in evolutionary terms, relatively new.
So Was Monogamy Natural?
That depends on what we mean by natural.
Did humans evolve with the ability to deeply bond to one person?
Absolutely.
Love, attachment, jealousy, and loyalty are all ancient human traits.
But did humans evolve as a species that practiced strict, lifelong, sexually exclusive monogamy as a universal rule?
History suggests otherwise.
Early human sexuality was fluid, adaptive, and responsive to circumstance.
Humans were not hardwired for only one relational path.
They were hardwired for connection, reproduction, and survival.
How those needs were met varied.
A lot.
The Beginning of a Bigger Question
If monogamy was not the unquestioned default of early human life, then where did the rigid social insistence on monogamy come from?
When did a flexible survival strategy become a moral expectation?
And who decided that one relational model was the only acceptable one?
That is where this story gets even more interesting.
Because monogamy did not begin as a sacred command.
It became one.
And in Part Two, we’ll trace exactly how.