Re: Born Gay?
fdrhs wrote:Are people born gay? Can we prove through DNA that someone was born to like the same sex? Do gay people make a CHOICE to be gay or to experiment in the gay world?
What is your view?
I doubt that DNA analysis will tell us much. The immediate information contained in our DNA describes the synthesis of proteins. Homosexuality is a high-level feature that is likely controlled by several genes, maybe thousands, and each of these genes influences other high-level features of our bodies too. My guess is that we will never learn anything meaningful about people's sexual orientation by parsing their genomes -- just as we will never learn anything meaningful about a Beethoven symphony by monitoring the change of air pressure while the orchestra plays it.
But I think there is a method that can give us insights into your questions: twin studies. You look at pairs of identical twins where one of the twins is gay, and you observe whether the other twin is gay too. To control for any effects from the "nurture" side, you repeat the experiment with non-identical twins. If people are gay by choice only, identical twins of gays will be just as likely to be gay than non-identical ones. If being gay is entirely hereditary, all identical twins of gays will be gay.
I have a vague memory of an article about twin studies in
Scientific American years ago. It described the principle of the method, as well as some application of it to specific physical and behavioral traits. One of those features was homosexuality. If my memory serves -- and that's a big "if"! -- it turned out that 5-10% of the gay's non-identical twins were also gay, and about 50% of the identical twins were.
Based on these numbers -- and again, this is by memory! -- I would conclude that our genes do have an important influence on our sexual orientation. Whether it's the only influence depends on how honest the twins' responses to the scientists were. If every respondent was honest, 50% means that there are other influences too, one of which may be choice. If all identical twins who said they were straight were in fact inside-the-closet gays who just
said they were straight, that means that genes are entirely controlling sexual orientation, and the only choice for a gay respondent is to be inside or outside the closet. Without further information, it could be either.
Summing up, from the empirical evidence, there is a range of explanations for someone's sexual orientation, but "choice and nothing else" seems to be firmly outside that range.