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Research: Left-handed Men Are Likely To Be Gay


Having at least one older brother increase the likelihood of not being straight and left-handed men siblings are likely to be gay according to the study published in the Proceedings of the National Academy of Sciences of the United States of America.


The study is introduced by four researchers from the University of Toronto and one researcher from Memorial University of Newfoundland.

The research came from 800 adult gay which they study their gender orientation, gender expression and three biomarkers namely handedness, fraternal birth order and existence of non-straight relatives.

Having at least one older brother has the percentage 14.8% tends to be being gay while a high 34% who are left handed are more likely to be gay.

It is estimated that 1 out of 7 homosexual males is due to their fraternal birth order effect. The researchers also found out that gay men are likely to be gender-conforming or they hide it.


“While the majority of both heterosexual and non-heterosexual men were grouped in the profile that did not have any biomarker, the three profiles associated with a biomarker were composed primarily of non-heterosexual men,” according to the researchers.

“Together, these findings suggest there are multiple distinct bio-developmental pathways influencing same-sex sexual orientation in men.” the researchers added.
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