Or late potty training
Or too long breast feeding
Or the color of the nursery
Or early walking
Or parents who are older, or younger
Or a single mother, or father
Or too much sugar
Or not enough sugar
Or, you get the idea.

What ridiculousness.

Can we say "this event is why they're an optimist" or "that is why they have a poor sense of humor"?

Nope.

Seems to me that sexual orientation is as much a part of someone's personality as any other part, so I don't know why we assume it develops so differently.

We can detect clear personality traits in a 6 month old infant (introversion vs extroversion) so we
know that some traits are wired in.

Finding the biological correlates will get away from the whole lifestyle choice nonsense.

I wasn't aware that they had discovered such specific markers yet, but I assumed that many existed.

I hope it didn't seem like I was implying a lifestyle choice. Nobody chooses their personality either.

Looking at how brain structure and brain chemistry may cause personality traits. There are more advanced brain imaging and mapping techniques these days to help with the research.

Working with infant subjects is interesting to determine wired in personality vs personality that is learned. Probably adult personality is a combination of nature vs nurture.

Clinical psychologists working with clients have long believed that sexual preference, orientation is wired in and not a choice. And is not an illness. Quite some time ago psychologists insisted that homosexuality, sexual preference, etc be taken out of the diagnostic manuals.

Yes I know that is not what you were implying htuttle. I wanted you to see that the research being done refutes the GOP and evangelical antiquated and unfair depictions of the LGBT community.

'Researchers think it's possible that when a woman gets pregnant with her first boy, this Y-linked protein gets into her bloodstream. The mother's body recognizes the protein as a foreign substance, and her immune system responds, creating antibodies. If enough of these antibodies build up in the woman's body and she gets pregnant with another a boy, they can cross the placental barrier and enter the brain of the second male fetus.'>>>

I don't see how scientific studies are comparable with the list you made.

He has four older brothers.

None of them gay.

Sample of one, but nevertheless.

I think some of the biochemistry behind this speculation is sound.

(hormonal washes) and there may be an inherited component from the maternal line.

Is the only boy among sisters.

This study is intriguing and makes sense on the surface of it. Perhaps it will be one of a few different etiologies.

From the Journal PNAS no less.

When it was first put forth a number of years ago, I did a quick check with my gay male friends (I have quite a few, being gay myself and having worked for a gay nonprofit). One of my closest friends is the youngest of five brothers--none of the others are gay. There were enough similar examples among the others that it made me feel there was something to this.