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[–]reluctant_commenter 4 insightful - 2 fun4 insightful - 1 fun5 insightful - 2 fun -  (0 children)

Yup, you're right. There is no single genetic cause of homosexuality, like there's not one "gay gene", but there is a number of genes that are associated with being gay. Which is how most genetic associations work, apart from a few particular genetic diseases.