Interesting history on that most versatile word. I don't know the origin, either; but I do have a sort of cartoon and poem that was printed in 1799. It shows a bare-assed woman on a horse with a man seated behind her and his penis in her. The poem is titled "NEW FEATS OF HORSEMANSHIP", and two lines in the poem reads:

"Corrina and her favorite buck

Are pleas'd to have a flying fuck"

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Well, fuck.

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