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Science & Health

Study links smaller testicles to better fathers

Published Friday, May 22, 2026

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Coverage is limited to a single perspective from a center-left Indian source.

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A study led by James Rilling in Atlanta has identified a correlation between lower testosterone levels, smaller testicles, and increased nurturing-related brain activity in fathers, suggesting a biological link to better parenting.

What We Know — Key Points

  • A study by James Rilling found that lower testosterone levels and smaller testicles are correlated with better parenting and more nurturing-related brain activity among tested fathers.

What Is Claimed — Perspectives

  • The HinduCenter-Left

    The article reports on a scientific study exploring the biological basis of paternal investment, including its findings, evolutionary context, and important caveats.

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