Identical twins homosexuality

The relationship between biology and sexual orientation is a subject of research. While scientists do not know what determines an individual's sexual orientation , they theorize that it is caused by a complex interplay of genetic , hormonal , and environmental influences. Biological theories for explaining the causes of sexual orientation are favored by scientists. A number of twin studies have attempted to compare the relative importance of genetics and environment in the determination of sexual orientation. Self reported zygosity , sexual attraction, fantasy and behaviours were assessed by questionnaire and zygosity was serologically checked when in doubt. Other researchers support biological causes for both men and women's sexual orientation.
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Biology and sexual orientation

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There's No Such Thing as a 'Gay Gene,' Massive Study Concludes | Live Science

Identical twins spend their lives being compared. They share duplicate DNA although it's expressed in different genes , as well as the same upbringing so they're generally similar individuals, notwithstanding the effort they put into being unique. And this is why I find two of my friends so interesting. Angus and Eric Woodward are identical 25 year-old twins from Melbourne. Eric is gay, while Angus is straight, which created an interesting microcosm of individualism as they hit puberty. Discovering sexuality is a journey for anyone, but maybe more so when you've got a twin who is also your opposite.
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Homosexual orientation in twins: A report on 61 pairs and three triplet sets

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But experts say the origins of partner preference remain a mystery. For men, new research suggests that clues to sexual orientation may lie not just in the genes, but in the spaces between the DNA, where molecular marks instruct genes when to turn on and off and how strongly to express themselves. That news, presented at the meeting of the American Society of Human Genetics on Thursday, may leave the genetically uninitiated scratching their heads.
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