(it has also been observed that order of birth correlates. The last male out of the womb is more frequently homosexual than his predecessors.)
Interesting...that would add an environmental factor, though, rather than the thought that it's something one is born with. After all, how would a male fetus have any way to "know" he would be the last boy his mother would have.
Interestingly, my brother-in-law, who is gay, is, in fact, the last male born in a family of 6 boys and a girl.
Sometimes I wonder about my own younger son, who, at the age of almost 23 has never had a girlfriend, though has always had female "best friends". I think he's just one of those who is not afraid of his feminine side, though. I can't imagine that he would not have had the courage to come out by now if he was, especially given that he knows no one in the family could care less about a person's sexual identity.
Not that this has anything to do with the thread. Not meaning to derail it (more than it has already been derailed!), just a mom's ramblings...