Identical twins have the same genes or DNA. They are nurtured in equal prenatal conditions. If homosexuality is caused by genetics or prenatal conditions and one twin is gay, the co-twin should also be gay … because identical twins are always genetically identical, homosexuality cannot be genetically dictated. No-one is born gay.
To drive the point home the Parents and Friends of Ex-Gays put up a billboard in Richmond.
Well what about it, people? Are gay men sissified by choice? And a burning love for Satan? Or is there something behind all the shenanigans? Might something come into play before a homosexual’s dirty free will to influence his behavior? Could it be biology? That’s a good question.
Let’s get right to PFOX’s argument. The identical twin of a gay man isn’t always gay. This is true.
In 2000 Bailey, Dunne and Martin studied a larger sample of 4,901 Australian twins… They found 20% concordance in the male identical or MZ twins and 24% concordance for the female identical or MZ twins. Self reported zygosity, sexual attraction, fantasy and behaviours were assessed by questionnaire and zygosity was serologically checked when in doubt. A meta-study by Hershberger (2001) compares the results of eight different twin studies: among those, all but two showed MZ twins having much higher concordance of sexual orientation than DZ twins, suggesting a non-negligible genetic component.
The odds of an identical twin also being gay are not 100%. The odds are closer to 20%. Unfortunately…
Chandra, Mosher, Copen, and Sionean (2011)
Data collected from a national sample of 13,495 men and women between 2006 and 2008. The study attempted to differentiate between sexual attraction, sexual behavior, and sexual identity. The percentage reporting their sexual identity as homosexual ranged from 2% to 4% of males, and about 1% to 2% of females.
…the incidence of random male homosexuality in the population is only around three percent. Which means when your twin is gay you’re seven times more likely to be gay as well. I’d say the data weigh in against PFOX. You might not be as tall as your dad but your height is certainly influenced by his DNA, for example. The facts suggest that genetics plays a crucial, though not definitive, role. Then there’s this:
Blanchard and Klassen (1997) reported that each additional older brother increases the odds of a man being gay by 33%. This is now “one of the most reliable epidemiological variables ever identified in the study of sexual orientation.” To explain this finding, it has been proposed that male fetuses provoke a maternal immune reaction that becomes stronger with each successive male fetus.
If you’re a first-born male, your odds of being homosexual are around three percent. Second born? Four percent. Third born? Five percent. The more older brothers you have, the more likely you’ll be gay. If you want to mis-interpret these facts and pretend that the teasing or bullying of an older brother encourages the queer, you’re out of luck. There are no data to suggest that younger bullies turn older brothers gay. Which would have fit PFOX’s agenda beautifully, don’t you think? A sissypants theory of general sexual biology.
There are also fascinating studies on the epigenetics of homosexuality, specifically related to the process of X-chromosome inactivation. And of course there’s the 20 year-old study on the structure of the hypothalamus in homosexual men. Taking this all in, complicated as it is, there’s only one thing we can say with a bit of confidence: Some men are born gay. Maybe not all of them, but a lot of them. Now, time for recess:
The South African man featured on an antigay billboard in Richmond, Virginia spoke up Thursday saying that he himself is gay and that he does not agree with the billboard’s message.
The ‘twins’ that PFOX featured on the billboard are, of course, homosexual.
Roux said that not only is he not a twin, he is an “out and proud gay man.”
“I was obviously quite shocked, so that why I decided to send you guys an email saying hey, I’m that guy in that billboard,” he wrote to Channel 12.