where monkeys could pay in fruit juice,

猴子可以用水果汁付款
by giving up fruit juice,

通过放弃水果汁
to look a picture either of the female's hindquarters

可以观看一幅图或者是雌性猴子的后半部
or of a celebrity monkey,

或是一只有名望的猴子
a socially dominant monkey,

一只社交上占统治地位的猴子
some sort of combination of People Magazine and Penthouse.

就像人物和阁楼的组合
And so, there's some interest in this even by non-human primates.

非人类的灵长类动物对此也有兴趣
What about actually preference for sexual variety?

实际上对性种类的偏好是什么呢
Well, you can get at this in different ways.

你可以通过不同的方式来获得
There is what biologists describe as the "Coolidge Effect."

生物学家描述为库立奇效应
I have this here.

我这里有
And the Coolidge Effect is

库立奇效应