Paying for physical reward with a member of the opposite gender is a practice documented since times immemorial. Many poems and mosaics well illustrate the fact in Ancient Greece and Ancient Rome.
We are now finding out that this practice is not specific to human primates only.
Longtailed macaques do exactly that, as reported by Michael Gumert, a Psychology researcher at Hiram College, OH, in the results of his 20 months study of macaques in Indonesia.
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