Multiple brothers being gay

All ten of the siblings in this family were to some degree homosexually experienced. For example, in Western cultures, homosexual males exhibit comparatively more gender-nonconforming behavior during childhood than heterosexual males. The study found that homosexual pedophiles had more older brothers than the gynephilic control group while the bisexual and heterosexual pedophiles did not. Women with straight sons, no sons, and also men had progressively lower levels of these antibodies. Sean O'Grady. There was one set of male dizygotic twins concordant for homosexuality in the family. Home Medical research.
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Largest study of gay brothers homes in on 'gay genes'

If the homosexual study group has too few siblings, in comparison to the heterosexual study group, the homosexual group will tend to show no difference in number of older brothers and may show a scarcity of other sibling types most commonly younger brothers and younger sisters. Participants were also asked "How sexually attracted are you to women? Behaviour Research and Therapy. The finding of the fraternal birth order effect in cisgender and transgender male androphiles, men attracted to boys and those attracted to adult men—same-sex attracted groups who differ as widely as possible in their own characteristics and in the characteristics of their desired partners—would suggest that fraternal birth order or the underlying variable it reflects may be the first universal factor to be identified in development of same-sex attraction in males. It has generally been thought that this maternal response would not apply to first born gay sons and that they may owe their orientation to genes, prenatal hormones and other maternal immune responses which also influence brain development. Ray Blanchard and Anthony Bogaert first identified the association in the s and named it the fraternal birth order effect.
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Men With Older Brothers More Likely To Be Gay? Study Expanding To Biological Origin | HuffPost

We are collecting samples of mothers of gay men and comparing them to mothers of heterosexual men and looking to see if there is evidence of a biological factor that differs between the two groups. The X chromosome is one of two sex chromosomes in mammals; the other is the Y chromosome. There was minimal recoverable information regarding the subjects' offense histories, and there is a possibility that the sexual preferences of the pedophiles in the study were not accurately classified from the available information. Series B, Biological Sciences. Trans women who are exclusively sexually oriented towards men have a greater number of older brothers than trans women who are sexually interested in women.
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Mom's Genetics Could Produce Gay Sons

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Description: There was minimal recoverable information regarding the subjects' offense histories, and there is a possibility that the sexual preferences of the pedophiles in the study were not accurately classified from the available information. Journal of Sex Research. Social Behavior and Personality. The result also indicates that mothers of gay sons, particularly those with older brothers, had significantly higher anti-NLGN4Y levels than did the control samples of women, including mothers of heterosexual sons.

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