If he was molested it does not mean he is gay. Was that his only experience?
As about hereditary there is some research done on genetics of homosexuality, I think it is inconclusive. Could be yes could be no.
I read a lot in it as my daughter is bisexual. There is no direct evidence of what causes homosexuality. Genes, hormones etc some research says part of if is environmental etc I don't think there is an answer
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