Whoa! Could this be true?!
WASHINGTON (AP)—Having several older brothers increases the likelihood of a man being gay, a finding researchers say adds weight to the idea that there is a biological basis for sexual orientation.
I dunno man. Let's see. How many older brothers do I have? One, two, three, four, five. Shit! I have five! They say though, that we all have to be related through our mother, which is not my case. But I do have lots of older brothers technically.
The full article: here.
I remember a few years back another attempt to prove that homosexuality was biological was done by a researcher who studied the brains of already dead gay men to see if there was a size difference in the size as compared to heterosexuals, or something to that effect. That study is here: brain study.
And further STILL was another study done to show the difference between certain fingers and their lengths in straight vs. gay men. While all these studies have been very interesting and have been rather accurate and indicative about the biological basis for homosexuality, the jury is still pretty much out proving all of this scientifically.
The only way to truly prove that being gay is truly something you are born with, you need not go far but ask one of your gay relatives or friends how old they were when they knew. And overwhelmingly, most will answer that they were mere children when they truly were aware. Yeah, one's environment can and probably does play a role, but it is minimal compared to just truly being born that way.
Regardless of older brothers, brain size, and finger lengths.