Are Humans Naturally Monogamous? | The Hook Up Podcast

Why It Matters

Understanding whether monogamy is biologically rooted or socially constructed influences marriage laws, relationship counseling, and public health strategies, shaping how societies support diverse partnership models.

Key Takeaways

• Human monogamy debated: biology vs social conditioning is
• Hidden ovulation may promote frequent sex for social bonding
• Testicle size and penis design suggest moderate mating competition
• Cambridge study ranks humans seventh in monogamy among 35 species
• Social vs sexual monogamy distinction shapes interpretation of human mating

Summary

The Hook Up Podcast tackles the perennial question, "Are humans naturally monogamous?" Host D. Selman and Pip Rasmusen frame the episode as a research‑driven deep dive, deliberately avoiding moral judgments about polyamory versus monogamy. They outline the scientific terrain, from evolutionary anthropology to neurobiology, to determine whether monogamy is a cultural construct or a biological imperative.

The discussion presents two opposing bodies of evidence. Pro‑non‑monogamy scholars cite Christopher Ryan’s *Sex at Dawn*, arguing that hidden ovulation encouraged frequent sex as a social glue in small, cooperative bands. Evolutionary biologists like David P. Barash highlight classic polygyne benefits—male sperm competition, increased genetic diversity, and resource acquisition—while noting that over 80% of early societies were polygynous. Physiological clues, such as medium‑sized testes and straightforward human penile morphology, are interpreted as signs of reduced sperm competition.

Conversely, researchers emphasizing innate monogamy point to oxytocin‑driven pair bonding, Helen Fisher’s brain‑imaging work, and Cat Bonahan’s analysis of primate reproductive anatomy, which suggests humans evolved for longer, more exclusive partnerships. A recent Cambridge study placed humans seventh on a monogamy scale among 35 species, with 66% full‑sibling rates—far higher than chimpanzees or dolphins. Evolutionary anthropologist Anna Matchen clarifies the critical distinction between social monogamy (co‑parenting) and true sexual monogamy, noting that only 0.0015% of species exhibit the latter.

The episode underscores that human mating strategies are neither wholly monogamous nor entirely promiscuous but exist on a spectrum shaped by biology, ecology, and culture. Recognizing the nuance informs relationship counseling, public policy on marriage, and personal expectations, urging listeners to align their partnership models with both evolutionary insights and individual values.

Original Description

Do you think humans are biologically wired for one partner? Or have we been socially conditioned into monogamy? We deep dive into the science and history of human relationships to figure out whether pairing with one person for life is our natural state of being, or if we’re actually biologically predisposed to be non-monogamous.

00:00 – coming up

00:26 – intro

02:08 – defining monogamy + polygamy

03:00 – your thoughts

04:15 – research backing non-monogamy

07:05 – research backing monogamy

11:10 – how we compare to other animals

14:25 – difference between social monogamy and sexual

16:10 – we’re cheaters

17:55 – serial monogamy

20:28 – history of monogamy

29:00 – social construct of monogamy

29:45 – what about jealousy?

The Hook Up is an ABC podcast, produced by triple j. It is recorded on the lands of the Wurundjeri people of the Kulin nation. We pay our respects to elders past and present. We acknowledge Aboriginal and Torres Strait Islander peoples as the First Australians and Traditional Custodians of the land where we live, work, and learn.