It turns out that the more males that have been through a womb, the more the womb is set up to produce gay offspring. So if you have three older brothers, it's double the normal probability that you're gay.
Now you say, UT, this seems unlikely. Can you show us an equally unconvincing argument for this probability using Google?
Sure. Google for the phrase
"older brother is gay": 265 results.
Google for the phrase
"younger brother is gay": 1620 results.
"older brother was gay": 87
"younger brother was gay": 1010
"gay older brother": 871
"gay younger brother": 1400