I think the evidence shows the vast majority of cases of homosexuality are genetic in origin, but my understanding is there's some evidence there could also be

I think the evidence shows the vast majority of cases of homosexuality are genetic in origin, but my understanding is there's some evidence there could also be an environmental role (be it exposure to certain substances or perhaps even how a child is raised) for a certain subset of cases. Research there risks treading into dangerous territory very quickly, since the study could be sensationalized to suggest the researchers are trying to claim that homosexuality is voluntary (which is very different from "environmentally-caused" or "environmentally-influenced"). Same reason why it's dangerous to study what genes may contribute to IQ.