I've decided to start a new thread on interesting scientific facts. I came across this one just this week.
- The more older brothers a man has, the greater that man's chance of being gay. For every older brother a man has, his chances of being gay increase by one third. Older sisters make no difference, and there's no corresponding effect for lesbians. A first-born son has about a 2 percent chance of being gay, and the numbers rise from there.
- Older brothers affect a boy only if the boy is right-handed. If the boy is left-handed--if his brain is organized in a left-handed fashion, it doesn't matter how many older brothers he has, his probability of being gay is just like the rest of the population.
The Science of Sexual Orientation, CBS News, 60 Minutes, March 12, 2006. [1]
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