Report
Older siblings may shape sexual orientation through a mother’s immune system
New Scientist reports that the long-observed link between men having older brothers and being more likely to be gay also has a counterpart involving older sisters.
TLDR
Men with older brothers are more likely to be gay, a long-observed association, New Scientist reports. An association has also been found with older sisters. The report describes how these links shed light on the possible role of a mother’s immune system in shaping sexual orientation.
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