Sexual orientation of men determined before birth
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Taken From:
http://news.yahoo.com/s/nm/20060627/ts_nm/sexual_orientation_men_determined_before_dc;_ylt=AqNaP5__zLB6vN4GETlL76p34T0D;_ylu=X3oDMTA0cDJlYmhvBHNlYwM-
Tue Jun 27, 12:38 AM ET
NEW YORK (Reuters Health) - A man's sexual orientation appears to be determined in the womb, a new study suggests.
Past research by Dr. Anthony F. Bogaert of Brock University in St. Catherines, Ontario and colleagues has shown that the more older brothers a man has, the more likely he is to be gay. But it has not been clear if this is a prenatal effect or a psychosocial effect, related to growing up with older male siblings.
To investigate, Bogaert studied 944 gay and straight men, including several who were raised with adopted, half- or step-siblings or were themselves adopted. He reasoned that if the relationship between having older male siblings and homosexuality was due to family environment or child-rearing practices, it would be seen whether or not a man's older brothers were biological or adopted.
Bogaert found that the link between having older brothers and homosexuality was present only if the siblings were biologically related -- this relationship was seen between biological brothers who were not raised together. The amount of time that a man was reared with older brothers had no association with sexual orientation.
"These results support a prenatal origin to sexual orientation development in men and indicate that the fraternal birth-order effect is probably the result of a maternal 'memory' for male gestations or births," Bogaert writes in his report in PNAS Early Edition.
A woman's body may see a male fetus as "foreign," Bogaert explains, and her immune response to subsequent male fetuses may grow progressively stronger.
"If this immune theory were correct, then the link between the mother's immune reaction and the child's future sexual orientation would probably be some effect of maternal anti-male antibodies on the sexual differentiation of the brain," he suggests.
Other lines of research also support the sexual orientation-maternal immune response link, he notes.
SOURCE: PNAS Early Edition, June 26, 2006.
Additional Readings:
1) http://news.yahoo.com/s/hsn/20060626/hl_hsn/homosexualityagainlinkedtobiologicalfactors
2) http://www.latimes.com/news/science/la-sci-brothers27jun27,0,407199.story -
tats new...
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Hmm...
**book a seat. Go get Karmelkorn and big gulp. -
can share?Originally posted by M©+square:Hmm...
**book a seat. Go get Karmelkorn and big gulp. -
Originally posted by mhcampboy:can share? Wait ah....
**Lay groundsheet and spread nicely.
Ok, lai share share. -
Originally posted by M©+square: Wait ah....
**Lay groundsheet and spread nicely.
Ok, lai share share.
why must lay groundsheet?? 
I scared already! -
big gulp~
my hubby has 3 older brothers!!!!!!
Did the study state how many older brothers..... is... MANY?!!! -
too bad for lesbians, ppl will still argue they can be influenced into lesbianism.
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I've read about this a long time ago...But even if it's true it doesn't mean that sexuality is pre-destined or deterministic. It just means that conditions in the womb may pre-dispose a child towards homosexuality but that does not mean that he will grow up to become a homosexual. Environment, education and nurture play important roles too.
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Why is it that when I started this very same topic in chit chat one day before this one, I have 100 views and no relies? huh huh?
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Beats meOriginally posted by casino_king:Why is it that when I started this very same topic in chit chat one day before this one, I have 100 views and no relies? huh huh?
Didn't see your article
I wonder what MC is waiting for
Hmmmmmm...... -
i think mc is waiting for heng
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Heng? But Heng don't like malesOriginally posted by alexkusu:i think mc is waiting for heng
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heng is activist maOriginally posted by elindra:Heng? But Heng don't like males -
Reading through, seems like one of many plausible reasons on why guys turn gay. But then, what will they do with the results?
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Erhmmm maybe just to explain why men turn gay?
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And so if they ultimately find out why man turn gay, whats next?
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Yes, mine was highly sexually orientated.
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heard that unborn baby will touch his peewee in his mum's womb.
have a feeling human beings are born to be mastubater.
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what if parents act on the resuls to decrease likelyhood of their kids being gay?Originally posted by elindra:Erhmmm maybe just to explain why men turn gay? -
like aborting male babies during pregnancy
then we have an overpopulation of females in this world -
The principles are very simple:
Let He Who Is Without Sin Cast The First Stone.
Judge not, that you be not judged.
Neither did this man sin, nor his parents; but, that the works of God might be revealed in him. -
there are too many guys in china and india, and too few females to go around.Originally posted by alexkusu:like aborting male babies during pregnancy
then we have an overpopulation of females in this world