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Actually, that is not entirely accurate. (Masters degree in biology here.) As it concerns homosexual men, they have located the most likely cause, which is epigenetic, and occurs in utero through immune-hormone triggers initiated by the mother. There is no "gene" for homosexuality, but fetal development can be influenced neurohormonally. Homosexual men have narrow corpus collosums in the brain, above average spatial sense and linguistic ability, etc. Because the CC forms around week 11, it suggests that homosexual predisposition will occur then as well. This implies that homosexuality, at least in males, is deeply hardwired and not a product of "nurture". Nurture is culture, and as we know from culture, there are lots of homosexuals masquerading as heterosexuals, even getting married and having kids with women. Males who are high in conscientiousness (one of the Big Five in psychology) tend to perform according to cultural duty. They will fulfill family duty even if it's at odds to their sexuality.
Maybe he'll listen to you

We have known for a long time that homosexual human males have distinguishing physiological features in a statistically significant way. It turns out that the more male offspring a woman tends to have, the higher the chances she will produce a homosexual male, particularly in women of high fecundity (fertility). Because a homosexual male in nature is less likely to have children, he will provide an altruistic, competitive fitness advantage to his siblings, increasing their survival rate, and in turn ensure survival of the fittest. In other words, homosexual men drive familial population fitness forward by being less likely to reproduce.
"Kinship selection, gay uncle theory, etc"