Scientists: Having older brothers increases men’s likelihood of being gay

MILWAUKEE — If you’re a guy with an older brother, there’s an increased chance you’re gay.

Scientists have noticed this pattern in previous research, but now they think they have a biological explanation as to why, and it starts long before birth. The results were published in the journal PNAS on Monday.

The researchers say that if their findings can be replicated, we may know at least one of the biological reasons some men are gay.

Many factors may determine someone’s sexual...

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