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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Biological versus nonbiological older brothers and men's sexual orientation
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Biological versus nonbiological older brothers and men's sexual orientation

机译:生物与非生物哥哥和男人的性取向

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The most consistent biodemographic correlate of sexual orientation in men is the number of older brothers (fraternal birth order). The mechanism underlying this effect remains unknown. In this article, I provide a direct test pitting prenatal against postnatal (e.g., social/rearing) mechanisms. Four samples of homosexual and heterosexual men (total n = 944), including one sample of men raised in nonbiological and blended families (e.g., raised with half-or step-siblings or as adoptees) were studied. Only biological older brothers, and not any other sibling characteristic, including nonbiological older brothers, predicted men's sexual orientation, regardless of the amount of time reared with these siblings. These results strongly suggest a prenatal origin to the fraternal birth-order effect.
机译:男性与性取向最一致的生物人口统计学相关性是哥哥的数量(兄弟出生顺序)。造成这种影响的机制仍然未知。在本文中,我提供了针对产前(如社交/抚养)机制的产前防蚀测试。研究了四个同性恋和异性恋男人样本(总计n = 944),其中包括一个在非生物学和混血家庭中养育的男人样本(例如,由同父异母或同级兄弟姐妹或被收养的父母养育的男性)。不管有多少兄弟姐妹抚养多长时间,只有亲生的兄弟姐妹而不是其他兄弟姐妹的任何特征,包括非生物学的兄弟姐妹都能预测男人的性取向。这些结果有力地暗示了兄弟般的出生顺序效应的产前起源。

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