Fraternal birth order and male sexual orientation
Fraternal birth order has been correlated with male sexual orientation, with a significant volume of research finding that the more older brothers a male has from the same mother, the greater the probability he will have a homosexual orientation. Ray Blanchard and Anthony Bogaert first identified the association in the 1990s and named it the fraternal birth order effect. Scientists have attributed the effect to a prenatal biological mechanism, since the association is only present in men with older biological brothers, and not present among men with older step-brothers and adoptive brothers. The mechanism is thought to be a maternal immune response to male fetuses, whereby antibodies neutralize male Y-proteins thought to play a role in sexual differentiation during development. This would
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Anthony BogaertBiology and sexual orientationBirth orderChildhood gender nonconformityCongenital adrenal hyperplasia due to 21-hydroxylase deficiencyDaryl BemEnvironment and sexual orientationFemminielloFraternal birth orderFraternal birth order and sexual orientationFraternal birth order effectGregory CochranH-Y antigenHandedness and sexual orientationHomosexual transsexualHomosexualityHuman male sexualityIndex of human sexuality articlesMarc BreedloveOlder brother effectOutline of LGBT topicsOutline of human sexualityParaphiliaPrenatal hormones and sexual orientationRay BlanchardSexual fluidity
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Fraternal birth order and male sexual orientation
Fraternal birth order has been correlated with male sexual orientation, with a significant volume of research finding that the more older brothers a male has from the same mother, the greater the probability he will have a homosexual orientation. Ray Blanchard and Anthony Bogaert first identified the association in the 1990s and named it the fraternal birth order effect. Scientists have attributed the effect to a prenatal biological mechanism, since the association is only present in men with older biological brothers, and not present among men with older step-brothers and adoptive brothers. The mechanism is thought to be a maternal immune response to male fetuses, whereby antibodies neutralize male Y-proteins thought to play a role in sexual differentiation during development. This would
has abstract
Efekt braterskiej kolejności u ...... ań są trudne do interpretacji.
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Existen algunas investigacione ...... a el efecto del hermano mayor.
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Fraternal birth order has been ...... o as the older brother effect.
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اقترحت الأبحاث وجود علاقة ما ب ...... مرتبطة بترتيب الولادة الأخوي.
@ar
兄弟出生順序和男性的性取向有關,是美國性學專家雷·布蘭查德( ...... 同性戀原因的研究中,只有兄弟出生順序與男性性取向有可靠相關。
@zh
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1,006,764,014
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Efekt braterskiej kolejności u ...... omoseksualizmu wśród mężczyzn.
@pl
Existen algunas investigacione ...... a el efecto del hermano mayor.
@es
Fraternal birth order has been ...... uring development. This would
@en
اقترحت الأبحاث وجود علاقة ما ب ...... مرتبطة بترتيب الولادة الأخوي.
@ar
兄弟出生順序和男性的性取向有關,是美國性學專家雷·布蘭查德( ...... 同性戀原因的研究中,只有兄弟出生順序與男性性取向有可靠相關。
@zh
label
Efecto del orden de nacimiento de los hermanos
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Efekt braterskiej kolejności urodzeń
@pl
Fraternal birth order and male sexual orientation
@en
ترتيب الولادة بين الأخوة والتوجه الجنسي للذكور
@ar
出生順序和男性性傾向關係
@zh