Camperio-Ciani Andrea, Corna Francesca, Capiluppi Claudio
Department of General Psychology, Università di Padova, via Venezia 8, 35100 Padua, Italy.
Proc Biol Sci. 2004 Nov 7;271(1554):2217-21. doi: 10.1098/rspb.2004.2872.
The Darwinian paradox of male homosexuality in humans is examined, i.e. if male homosexuality has a genetic component and homosexuals reproduce less than heterosexuals, then why is this trait maintained in the population? In a sample of 98 homosexual and 100 heterosexual men and their relatives (a total of over 4600 individuals), we found that female maternal relatives of homosexuals have higher fecundity than female maternal relatives of heterosexuals and that this difference is not found in female paternal relatives. The study confirms previous reports, in particular that homosexuals have more maternal than paternal male homosexual relatives, that homosexual males are more often later-born than first-born and that they have more older brothers than older sisters. We discuss the findings and their implications for current research on male homosexuality.
我们研究了人类男性同性恋的达尔文悖论，即如果男性同性恋具有遗传成分，且同性恋者的繁殖率低于异性恋者，那么为何这一特征在人群中依然存在？在一个由98名同性恋男性、100名异性恋男性及其亲属（总计超过4600人）组成的样本中，我们发现同性恋男性的母系女性亲属比异性恋男性的母系女性亲属生育力更高，而在父系女性亲属中未发现这种差异。该研究证实了先前的报道，特别是同性恋男性的母系同性恋亲属比父系同性恋亲属更多，同性恋男性中晚出生的比头胎出生的更常见，且他们的哥哥比姐姐更多。我们讨论了这些发现及其对当前男性同性恋研究的启示。
