Lives Well Lived ANNA MACHIN: monogamy is unnatural
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Sep 4, 2025 
In this engaging discussion, Anna Machin, an evolutionary anthropologist from the University of Oxford, dives into the science of love and bonding. She elucidates the biological roots of attraction and the neurochemistry behind falling in love. Listeners discover the distinctions between lust, attraction, and the complexities of jealousy within monogamy and polyamory. Machin also shares insights on how cultural norms shape our understanding of relationships and the essential role of paternal figures in fostering emotional bonds and resilience in children.
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Monogamy Is Mostly Cultural
- Humans are biocultural: social monogamy is common but sexual monogamy is rare.
- Cultural rules enforce monogamy even when biology often allows extra-pair mating.
Jealousy’s Evolutionary Message
- Jealousy signals threats to reproductive status, not merely emotional betrayal.
- Men fear cuckoldry; women fear resource-splitting and reduced investment.
Polyamory Can Be Genuine And Lasting
- Polyamory exists on a spectrum and can produce comparable relationship satisfaction.
- Data are limited, but many polyamorous people report non-zero-sum love and sustained relationships.
