When did the usage of word " ***" for describing a person's posterior start?

" kick in the ***" etc,. there are many words in which the word " ***" is used to denote the Butt/Posterior of a person. The dictionary meaning of *** is very different. this colloqial usage of this word to denote one's behind, when did it start? In my opinion it's not more than 20... show more " kick in the ***" etc,. there are many words in which the word " ***" is used to denote the Butt/Posterior of a person.

The dictionary meaning of *** is very different. this colloqial usage of this word to denote one's behind, when did it start? In my opinion it's not more than 20 years. Please corroborate.
Update: The word *** in actually used as a synonym for an animal; Donkey
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