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The phenomenon is related to a protein linked to the Y chromosome which women do not have that is important to male brain development.

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Researchers think it's possible that when a woman gets pregnant with her first boy, this Y-linked protein gets into her bloodstream. The mother's body recognizes the protein as a foreign substance, and her immune system responds , creating antibodies. If enough of these antibodies build up in the woman's body and she gets pregnant with another a boy, they can cross the placental barrier and enter the brain of the second male fetus.

Earlier research has shown that the more older brothers a boy has, the more of a chance that boy will be attracted to men. A study showed that with each brother, the chance that a man will be gay goes up by about a third, but the researchers didn't determine why that was. Bogaert and his co-authors tested a small group of women and 12 men ages 18 to 80 and found a higher concentration of antibodies to the protein, known as NLGN4Y , in blood samples from women than from men.

They found the highest concentration of antibodies to the protein in women with gay younger sons who had older brothers, compared with women who had no sons or who had given birth to only heterosexual boys.

Having older brothers increases men's likelihood of being gay

Sun, sex and sculpted timber: How architecture shaped Fire Island Pines. The study builds on research Bogaert and his co-authors have been exploring for more than 20 years.

Since their initial research that noted the trend, other research -- although not all studies -- have detected the phenomenon, even across cultures. One found that a man's chances of being gay increased even if he was raised apart from his older brother. Researchers did not see a similar pattern in families with adopted brothers , so scientists started to think there must be a maternal developmental explanation.

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The research does not give a biological explanation for why some men may be bisexual or may not be attracted to anyone at all, nor can it give a biological explanation for gay only children , gay oldest sons or women who are attracted to women. Michael Bailey , a professor in the Department of Psychology at Northwestern University, thinks the latest research is important.

They say they were stabbed because they were holding hands and stranger yelled homophobic slurs. Hear their terrifying story. In Starbucks there was a gay couple and a little boy asked his mom: Just saw two high school boys holding hands as they walked around town.


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Such courage. Times are really changing! Just saw a middle school aged gay couple holding hands in a small town in UTAH and I'm pretty sure my grinch heart grew 3 sizes.

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Random gay couple holding hands. When I came out in 80's this casual PDA was unthinkable. I love when I see gay couples walking down the street holding hands. Share On facebook Share On facebook Share.

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