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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Because if you inter-mate with your kin you have bad offspring因为这对你和你亲属的后代不好 -
and so animals should be wired up所以动物应该避免 -
not to mate with their kin.和亲属交配 -
And in fact, this is what happens.事实上 事情也正是如此 -
There are--Parents of teenagers have all sorts of concerns.青少年的父母有各种各样的担心 -
And a lot of the concerns are, in fact, sexual.其中很大一部分跟性有关 -
How do you keep your son and/or your daughter如何避免你的儿子或女儿 -
from going out and having sex with too many people,和太多的人和错的人发生性行为 -
or the wrong people, or unprotected sex?或者没有保护措施的性行为 -
But there are no parenting guides in the world that say但是世界上没有父母指导书会说 -
"How do you keep your children如何保证你的孩子们 -
from having sex with one another?"不会相互之间发生性行为