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The most accepted biological cause of a homosexual orientation is the balance of intra-uterine hormones the mother has during pregnancy. This results in the chemical balance in the brain of the baby, therefore determining its sexual orientation.

Recent studies done in 2013 have shown that the connection to genetic sequences is stronger than previously thought.

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10y ago
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9y ago

As far as is known there is no biological root or reason that a persons sexual orientation is defined.

The biological route for sexual orientation are the sex hormones, genes, prenatal hormones and brain structure. There is no one cause. There is no scientific study that support a specific biological reason.

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Q: What is a biological explanation for how a gay orientation develops?
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