How older siblings may shape sexual orientation via mother’s immune system

Written and edited by the WorldPing NewsdeskPublished Updated Original reporting: New Scientist
How older siblings may shape sexual orientation via mother’s immune systemWorldPing
Image via New Scientist.

What happened

It has long been observed that men with older brothers are more likely to be gay, but an association has also been found with older sisters.This sheds further light on how a mother's immune system may be involved in shaping sexual orientation…

Key facts

  • Reported by New Scientist and published Wed, 16 Sep 2026 15:50:33 UTC.

Why it matters

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Coverage timeline

When each newsroom published on this story, oldest first — all times UTC.

  1. Scientists find an immune “false alarm” that may drive rapid aging

  2. How older siblings may shape sexual orientation via mother’s immune system

Sources

The original report was published by New Scientist. WorldPing does not claim that reporting — this page summarises and contextualises it.

Read the full report at New Scientist

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