来自《耶鲁大学开放课程：心理学导论 第14集》

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  certainly your answer about the origin of sexual preference
  要了解人类的性别偏好的源头
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  in humans will be informed
  就要提到
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  by the question of cross-species data.
  不同种类间的数据
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  What we do know is that there are many animals
  但我们确实知道的是很多其他动物
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  that engage in homosexual behavior;
  都存在同性恋行为
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  they engage in sex with members of their own sex.
  他们会和同性发生性行为
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  What I don't know is
  而我不知道的是
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  whether you get exclusive homosexual behavior.
  你是不是指纯粹同性行为
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  So, I don't know what the rate is in nonhuman primates,
  我不知道非人灵长类的情况
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  for instance, of primates
  例如那些不想和
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  who do not want to have sex with members of the opposite sex.
  异性猴子发生性关系的灵长类的情况