然而，互惠利他主义不是无条件的。
互惠利他主义的博弈论模型中的基本假定，都建立在理性预设的基础之上。
The basic assumptions in the game theory models of reciprocal altruism are based on the presupposition on rationality in behavior.
他认为，自然选择对于那些曾经是利他主义者的人是有利的，因为我们的祖先生活在小而密集的群体中，人们的利他主义可以指望得到相互间的利益互惠。
He argues that natural selection favored humans who were altruistic because in the small, close-knit groups in which our ancestors lived, altruists could expect reciprocity.
与此同时，其他一些表面上看来的利他主义行为往往也仅仅是互惠。
Meanwhile, other ACTS of seeming altruism are often just reciprocity.
第二种形式是互惠的利他主义，或者说“你帮我搓背我也帮你搓背”。
The second form is reciprocal altruism, or "you scratch my back and I'll scratch yours".
第二种形式是互惠的利他主义，或者说“你帮我搓背我也帮你搓背”。
The second form is reciprocal altruism, or "you scratch my back and I'll scratch yours".
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