The primitive social stage of promiscuity, if it ever existed, belongs to such a remote epoch that we can hardly expect to prove its existence directly by discovering its social fossils among backward savages.

• 那个原始社会阶段，如果确实存在过的话，也是属于非常遥远的时代，以致在社会的化石中间，在落后的蒙昧人中间，我们未必可以找到它在过去存在的直接证据了。