Study Lks Gay Men To Olr Brothers - CBS News

Contents:

• MEN WH OLR BROTHERS ARE MORE LIKELY TO BE GAY, STUDY SUGGTS
• HAVG OLR BROTHERS CREAS MEN’S LIKELIHOOD OF BEG GAY
• BOYS WH OLR BROTHERS MORE LIKELY TO BE GAY, STUDY SAYS
• DO HAVG OLR BROTHERS INCREASE MEN’S CHANC OF BEG GAY? HERE’S WHAT THE STUDI SAY
• THERE IS NO ‘GAY GENE.’ THERE IS NO ‘STRAIGHT GENE.’ SEXUALY IS JT PLEX, STUDY NFIRMS
• STUDY LKS GAY MEN TO OLR BROTHERS
• STUDY SUGGTS MAL WH OLR BROTHER MORE LIKELY TO BE GAY
• HAVG OLR BROTHERS INCREAS A MAN'S ODDS OF BEG GAY
• STUDY OF NE LN PEOPLE DIT THAT MEN WH OLR BROTHERS ARE MORE LIKELY TO BE GAY
• HAVG MORE OLR BROTHERS CREAS MEN’S ODDS OF BEG GAY, STUDY NFIRMS
• PEOPLE WH OLR BROTHERS ARE MORE LIKELY TO BE GAY ACRDG TO EXPERTS
• ARE YOUNGER BROTHERS MORE LIKELY TO BE GAY?

MEN WH OLR BROTHERS ARE MORE LIKELY TO BE GAY, STUDY SUGGTS

Men wh olr brothers are more likely to be gay, acrdg to a study published Wednday the journal Proceedgs of the Royal Society B. This new report builds upon prev rearch regardg male birth orr and homosexualy, though there is still no cisive ncln as to why there’s a lk between the cross-analyzg data om 10 scientific studi wh more than 5, 000 subjects, rearchers found that men wh olr brothers were 38 percent more likely to intify as gay.

”The study, which pared the probabily of the youngt brother a two-son fay beg gay as pared to the olst son, did not clu female subjects, as prev rearch has tablished that women do not fluence the sexual orientatn of their younger siblgs, acrdg to this study did not terme a ncrete reason for the rrelatn between a man havg an olr brother and intifyg as gay, Blanchard said that “pots toward the need for more rearch on the 'maternal immune hypothis'” — a theory Blanchard troduced 1996 that suggts that a mother is exposed to “male-specific substanc” durg pregnancy wh or the birth of a son. Acrdg to proponents of the theory, the mother’s immune rponse is changed durg the pregnancy of a boy, creasg the likelihood that a subsequent male child would be gay.

Earlier studi have noticed that gay men often have olr brothers. If you’re a guy wh an olr brother, there’s an creased chance you’re gay.

HAVG OLR BROTHERS CREAS MEN’S LIKELIHOOD OF BEG GAY

The rearchers say that if their fdgs n be replited, we may know at least one of the blogil reasons some men are gay. A 2006 study showed that wh each brother, the chance that a man will be gay go up by about a third, but the rearchers didn’t terme why that was.

They found the hight ncentratn of antibodi to the prote women wh gay younger sons who had olr brothers, pared wh women who had no sons or who had given birth to only heterosexual boys.

One found that a man’s chanc of beg gay creased even if he was raised apart om his olr brother. The rearch do not give a blogil explanatn for why some men may be bisexual or may not be attracted to anyone at all, nor n give a blogil explanatn for gay only children, gay olst sons or women who are attracted to women.

BOYS WH OLR BROTHERS MORE LIKELY TO BE GAY, STUDY SAYS

Bailey’s latt paper, published this month the journal Nature Rearch, looked at people’s genom and found several regns wh sgle-letter DNA chang that were more mon among gay men than straight men and may be relevant to the velopment of sexual orientatn. In the first-ever laboratory study of mothers of gay men, the rearch was prompted by more than two s of statistil data examg the 'olr brother effect' which shows that blogil olr brothers—but not olr sisters—crease the odds of homosexualy later-born mal.

The study, "Male Homosexualy and Maternal Immune Rponsivy to the Y-Lked Prote NLGN4Y, " was published Monday, Dec. The current study adds to the growg scientific nsens that homosexualy is not a choice, but rather an nate predisposn.

The team of psychologists and immunologists tted 16 women wh no sons, 72 mothers wh heterosexual sons, 31 mothers of gay sons wh no olr brothers, 23 mothers of gay sons wh olr brothers, and a ntrol group of 12 men.

DO HAVG OLR BROTHERS INCREASE MEN’S CHANC OF BEG GAY? HERE’S WHAT THE STUDI SAY

The team found that mothers of gay sons, pecially those wh olr brothers, had signifintly higher antibody levels to both forms of NLGN4Y than did the ntrol sampl of women, cludg mothers of heterosexual sons.

THERE IS NO ‘GAY GENE.’ THERE IS NO ‘STRAIGHT GENE.’ SEXUALY IS JT PLEX, STUDY NFIRMS

However, the psychologist utns that the effects are most and the likelihood of a male child beg born gay is still small—even if they have multiple male siblgs. Male homosexualy and maternal immune rponsivy to the Y-lked prote NLGN4Y, Proceedgs of the Natnal Amy of Scienc (2017).

Study nfirms lk between the number of olr brothers and creased odds of beg homosexual (2017, December 12). New rearch found that havg an olr brother creas men’s chanc of beg gay, acrdg to a study published Wednday the journal Proceedgs of the Royal Society B. The fdgs om German and Canadian scholars showed that men wh olr brothers have a 38% higher likelihood of beg homosexual than men who don’t have an olr brother.

“[Olr] brothers crease the probabily of homosexualy later-born mal, ” read the study’s abstract.

STUDY LKS GAY MEN TO OLR BROTHERS

The fdgs also showed that the more olr brothers a man had, the higher the likelihood he would be gay. Havg three olr brothers doubled a man’s chanc of beg gay, acrdg to the rearch. The study also found a rrelatn between mothers givg birth to homosexual mal and havg more children, as pared to moms of straight mal havg fewer children.

STUDY SUGGTS MAL WH OLR BROTHER MORE LIKELY TO BE GAY

“[Mothers] of homosexual mal produce more offsprg than the mothers of heterosexual mal, ” the rearchers wrote.

HAVG OLR BROTHERS INCREAS A MAN'S ODDS OF BEG GAY

“The fascatg study timat that havg an olr brother creas the odds of beg gay by 38 percent, supportg the ia that a mother’s immune rponse to havg a male child fluenc subsequent boys, ” Universy of Cambridge profsor and statistician David Spiegelhalter told the Daily Mail. Ined, no particular pattern of siblgs, their genr or their age appeared to terme whether a female would be gay.

WASHINGTON, DC - APRIL 28: A man reach out to a large rabow flag which is placed support of gay marriage ont of the U.

(Photo by Astrid Riecken For The Washgton Post via Getty Imag)Photograph by Astrid Riecken — The Washgton Post/Getty ImagIs beg gay lked to geics?

STUDY OF NE LN PEOPLE DIT THAT MEN WH OLR BROTHERS ARE MORE LIKELY TO BE GAY

But a major new study, nducted over 20 years, suggts that men who are gay tend to have a greater number of olr brothers—and for an actual, scientific reason. “Gay men have, on average, a greater number of olr brothers than do heterosexual men, a well-known fdg wh sexual science, ” wrote the rearchers om Canada’s Brock Universy, the Universy of Toronto, and Harvard Medil School a study published the scientific journal uld expla such a phenomenon? “This explanatn poss that some mothers velop antibodi agast a Y-lked prote important male bra velopment, and that this effect be creasgly likely wh each male gtatn, alterg bra stctur unrlyg sexual orientatn their later-born sons, ” wrote the study thors, who also strsed that more rearch needs to be done on the issue to nfirm their Universy’s Anthony Bogaert, one of the lead study thors, further emphasized the rearch is not meant to suggt that beg gay is some sort of illns or geic fect.

There is no sgle gene rponsible for a person beg gay or a lbian. The study of nearly a half ln people clos the door on the bate around the existence of a so-lled “gay gene.

In s stead, the report fds that human DNA nnot predict who is gay or heterosexual.

HAVG MORE OLR BROTHERS CREAS MEN’S ODDS OF BEG GAY, STUDY NFIRMS

It is worth keepg md that this study only vers some typ of sexualy — gay, lbian and cis-straight — but don’t offer many sights to genr inty. Humans have tried to unrstand human sexualy for centuri — and geics rearchers joed the ay the early 1990s after a seri of studi on tws suggted homosexualy ran fai.

“As a teenager tryg to unrstand myself and unrstand my sexualy, I looked at the ter for “the gay gene” and obvly me across Xq28, ” said Fah Sathirapongsasuti, a study -thor and senr scientist at 23andMe, which he joked once led him to believe he hered his gayns om his mother. “We worried a lot about volunteer bias, ” said Bailey, whose rearch clus a wily publicized study on Xq28 and gay brothers om 2018. Sanrs llaborated wh Bailey on those earlier studi and said their work had always admted that there was no sgle “gay gene.

The rearchers had members of the same-sex muny review the study’s sign and language, and they adm that their termology and fns for gay, lbian and heterosexual do not reflect the full nature of the sexualy ntuum. In other words, tri to judge if a person leans gay, straight or bisexual. “[Our study] unrsr an important role for the environment shapg human sexual behavr and perhaps most importantly there is no sgle gay gene but rather the ntributn of many small geic effects sttered across the genome, ” Neale said.

PEOPLE WH OLR BROTHERS ARE MORE LIKELY TO BE GAY ACRDG TO EXPERTS

Are you a gay man? A new study om the journal PNAS sheds new light on the "aternal birth orr effect" -- a prevly observed trend that gay men, on average, have a greater number of olr brothers than straight rearch looked to an "immunlogoil explanatn" to expla this trend.

They disvered the hight ncentratn of NLGN4Y women who had gay sons wh olr brothers. A 2006 study found that a boy is likelier to be gay the more olr blogil brothers he has. The study offers no explaatn for same-sex attractn women, bisexualy, or gay only sons.

Earlier this month, a separate study found two gen more mon gay men. Havg several olr brothers creas the likelihood of a man beg gay, a fdg rearchers say adds weight to the ia that there is a blogil basis for sexual orientatn.

ARE YOUNGER BROTHERS MORE LIKELY TO BE GAY?

Cathar, Ontar, "This and other studi suggt that there is probably a blogil basis for" homosexualy. Bogaert studied four groups of Canadian men, a total of 944 people, analyzg the number of brothers and sisters each had, whether or not they lived wh those siblgs and whether the siblgs were related by blood or reports a paper appearg Tuday's issue of Proceedgs of the Natnal Amy of Scienc that havg several blogil olr brothers creased the chance of a man beg 's an effect that n be tected wh one olr brother and be stronger wh three or four or more, Bogaert said a telephone, he add, this needs to be looked at ntext of the overall rate of homosexualy men, which he suggted is about 3 percent. The effect of birth orr on male homosexualy has been reported prevly, but Bogaert's work is the first signed to le out social or environmental effects.

Bogaert said he nclud the effect was blogil by parg men wh blogil brothers to those wh brothers to whom they were not blogilly crease the likelihood of beg gay was seen only those whose brothers had the same mothers, whether they were raised together or not, he raised wh several olr step- or adopted brothers do not have an creased chance of beg gay. A team of rearchers om the Universy of Toronto, the Instute of Sexology and Sexual Medice, Charé – Universätsmediz Berl and the Universy of Lethbridge has found evince showg that mal wh an olr brother have a greater chance of beg gay than mal that do not. Scientists are not currently able to expla homosexualy eher mal or femal, even as rearchers ntue to fd the answer.