The more older brothers a man has the greater the chance of them being gay, The Daily Telegraph of London reported.
据英国《每日电讯报》报道，哥哥越多的男性越容易成为同性恋。
Scientists from Brock University found each older brother raised the odds that a man was homosexual by a third, after collecting data from almost 1,000 men.
布鲁克大学的研究者通过对近千名男性的调查发现，哥哥每多一个，弟弟为同性恋的几率就高1/3。
It is thought that when a mother is pregnant with a boy she produces antibodies that attack the part of the unborn baby's brain that controls sexuality. The strength of these antibodies is said to increase with each son, raising the odds of homosexuality for the youngest son.
研究称，身怀男胎的妇女会分泌一种抗体，影响胎儿控制性取向的大脑部分，每怀上一个男孩后这种抗体的强度都会递增，导致最小男孩成为同性恋的几率增大。
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