Aha. See, now you're putting words in my mouth. I never said random, i said a chance occurence. And we all know that as circumstances change, so do your chances.
Since you aren't inclined to say why environmental factors or choice matter, I will explain.
The theory (yes theory to be correct) that I have most faith in (as it's the only one that can actually envelope such a wide array of differences between gay and straight people) is prenatal hormones.
On average, gay men typically have a different finger-length ration than straight men.
1. Everything involving the human body in the womb is a result of hormones recieved by the developing fetus. Yes, even hands and fingers are included in this.
There is also a difference in the auditory system of the brain between gay men and straight men. The auditory system is, likewise, developed by prenatal hormones.
2
Homosexuals also have higher levels of circulating androgens than heterosexuals.
3
Random. Not hardly. Gay men typically have older borthers. A male fetus in a woman's body is seen by her antibodies as a foreign object. These antibodies attempt to neutralize (aka feminize) this body to protect the mother. With each successive older borther, the amount and strength of these antibodies increase and become betetr and better at making typically masculine body parts, such as auditory systems and finger lengths, more feminine.
4
So random? I never said that, and I'd have to be a damn fool to believe its random.
So, now that we have that cleared up, mind telling me how environmental (unless we are being loose with this term, I'm assuming you mean outside of the womb) or choice has any relevancy to sexual orientation?