We review research supporting biological mechanisms in the development of sexual orientation. This research includes studies on neural correlates, prenatal hormones and related physical/behavioral correlates, genetics, and the fraternal birth order effect (FBOE). These studies, taken together, have provided substantial support for biological influences underlying the development of sexual orientation, but questions remain unanswered, including how biological mechanisms may differ in contributing to men's and women's sexual orientation development.

中文翻译：

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关于性取向发展的生物学研究的简短回顾。

我们审查支持性倾向发展中的生物学机制的研究。这项研究包括有关神经相关性，产前激素和相关的身体/行为相关性，遗传学以及兄弟出生顺序效应（FBOE）的研究。这些研究加在一起，为性取向发展的潜在生物学影响提供了实质性支持，但问题仍未得到解答，包括生物学机制在促进男女性取向发展方面可能有何不同。