I n a recent Guardian article , Simon Copland argued that it is very unlikely people are born gay or presumably any other sexual orientation. Scientific evidence says otherwise. It points strongly to a biological origin for our sexualities. I would argue that understanding our fundamental biological nature should make us more vigorous in promoting LGB rights.
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“This is the Way God Made Me”
Despite what you may have read, there's no 'gay gene' | Genetic Literacy Project
Nature News were among the first to break the story based on a conference abstract. Others quickly followed suit , many using a press release issued by the conference organizers. Meanwhile, the mood at the conference has been decidedly less complimentary , with several geneticists criticizing the methods presented in the talk, the validity of the results, and the coverage in the press. He analyzed , regions in the genomes of the twins and looked for methylation marks—chemical Post-It notes that dictate when and where genes are activated. He whittled these down to around 6, regions of interest, and then built a computer model that would use data from these regions to classify people based on their sexual orientation. The best model used just five of the methylation marks, and correctly classified the twins 67 percent of the time. The problems begin with the size of the study, which is tiny.
'Gay genes': science is on the right track, we're born this way. Let’s deal with it.
The relationship between biology and sexual orientation is a subject of research. While scientists do not know the exact cause of sexual orientation , they theorize that a combination of genetic, hormonal, and social factors determines it. Biological theories for explaining the causes of sexual orientation are favored by scientists  and involve a complex interplay of genetic factors, the early uterine environment and brain structure.
In a large study of more than , men and women in the United States, United Kingdom and Sweden, researchers discovered four genetic variants that occur more often in people who indicated on questionnaires that they had had same-sex sexual partners. The other two influence sex partner choice for both men and women. Collectively, the DNA differences explained only 8 to 12 percent of the heritability of having same-sex partners.