CNN If you're a guy with an older brother, there's an increased chance you're gay. Clarification: A previous version of this story referred to higher concentrations of the protein instead of higher concentrations of antibodies to the proteins when describing the findings of the study. Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds.
We may know why younger brothers are more likely to be gay | New Scientist
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Having older brothers increases men's likelihood of being gay
By Andy Coghlan. Anthony Bogaert at Brock University, Canada, and his team think that some women who are pregnant with boys develop antibodies that target a protein made by the Y chromosome. Our immune systems make antibodies to recognise foreign molecules, which have the potential to be from dangerous bacteria.