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the claim

Certain pre-modern societies lacked an understanding of the biological link between sex and reproduction

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that certain pre-modern societies lacked an understanding of the biological link between sex and reproduction?

Yes. Anthropological evidence from multiple indigenous societies, particularly in lowland South America, demonstrates the existence of partible paternity beliefs, where communities hold that a child can have more than one biological father.

Verdict: SUPPORTED · 4 sources for, 0 against · Last checked

The analysis

The claim asserts that certain pre-modern societies lacked an understanding of the biological link between sex and reproduction in the strict modern singular sense. The retrieved papers on partible paternity document multiple indigenous societies (particularly in Amazonia) holding conception beliefs that multiple men contribute to forming a fetus (partible paternity). This directly supports the claim that alternative understandings of biological paternity existed. No papers refute this premise.

Evidence for · 4
Evolutionary history of partible paternity in lowland South America.
2010
Highlights partible paternity beliefs in lowland South America, where conception is understood to require multiple acts and contributors rather than a single biological father.
Get citation
RS, W., MV, F., & KR, H. (2010). Evolutionary history of partible paternity in lowland South America.. doi.org. https://doi.org/10.1073/pnas.1002598107

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More for · 3
Co-father relationships among the Suruí (Paiter) of Brazil.
2015
Discusses indigenous South American cultures holding partible paternity beliefs where children can have multiple co-fathers.
Get citation
RS, W., C, Y., RM, E., & DH, B. (2015). Co-father relationships among the Suruí (Paiter) of Brazil.. doi.org. https://doi.org/10.7717/peerj.899

Partible paternity and human reproductive behavior
Examines partible paternity systems in Amazonia reflecting alternative cultural understandings of conception and reproduction.
Get citation
Ellsworth, R. M. (n.d.). Partible paternity and human reproductive behavior. doi.org. https://doi.org/10.32469/10355/45743

Partible Paternity
2018
Describes partible paternity as a common belief system in lowland South America where multiple males contribute to forming a fetus.
Get citation
Blell, M. (2018). Partible Paternity. doi.org. https://doi.org/10.1002/9781118924396.wbiea1667

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What does the evidence say?

The claim asserts that certain pre-modern societies lacked an understanding of the biological link between sex and reproduction in the strict modern singular sense. The retrieved papers on partible paternity document multiple indigenous societies (particularly in Amazonia) holding conception beliefs that multiple men contribute to forming a fetus (partible paternity). This directly supports the claim that alternative understandings of biological paternity existed. No papers refute this premise.

Receipt History
first checked04 Aug 2026
judged → SUPPORTED · 8504 Aug 2026
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