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The best theories at this time appear to be related to maternal antibodies/the environment in the womb, although genetics has an influence as well. Hormones in the womb also seem to play a role. I'm the youngest boy my mother had, though my fiance was the oldest boy and his younger brother is straight. That being said, I think his homophobic father's a fag (I'm not the only one who thinks so), so it may be genetics with my beau. His almost 60 year-old father gets hair highlights and wears pink clothing. https://en.wikipedia.org/wiki/Environment_and_sexual_orientation "...Maternal immune responses during fetal development are strongly demonstrated as causing male homosexuality and bisexuality. Research since the 1990s has demonstrated that the more male sons a woman has, there is a higher chance of later born sons being gay. During pregnancy, male cells enter a mother's bloodstream, which are foreign to her immune system. In response, she develops antibodies to neutralize them. These antibodies are then released on future male fetuses and may neutralize Y-linked antigens, which play a role in brain masculinization, leaving areas of the brain responsible for sexual attraction in the female-typical position, or attracted to men. The more sons a mother has will increase the levels of these antibodies, thus creating the observed fraternal birth order effect. Biochemical evidence to support this effect was confirmed in a lab study in 2017, finding that mothers with a gay son, particularly those with older brothers, had heightened levels of antibodies to the NLGN4Y Y-protein than mothers with heterosexual sons. J. Michael Bailey has described maternal immune responses as "causal" of male homosexuality...".