来自《耶鲁大学开放课程：心理学导论 第10集 第10集》
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And this sort of instinctive response这种本能反应 -
is what you get from an evolutionary analysis of sex.就是从对性的进化分析中得到的 -
But this story is deeply incomplete但是故事还远不止此 -
because the question that gets raised is因为这会引出另一个问题 -
"how do you tell?"如何区分 -
You don't want to have sex with your kin你不想和亲属做爱 -
but how do you tell your kin?但是你怎么区分你的亲属呢 -
People don't carry their DNA markers人们不会带着你能看到的 -
on strips that you could see.基因标识条 -
How do you tell who your kin are?你怎么知道谁才是有血缘关系的呢 -
And this actually turns out to be a really interesting question.这事实上是个非常有趣的问题 -
It used--And some research suggests that the answer is simple.一些研究结果表明答案很简单