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 ==Carl Jung== 
 Did Carl Jung really connect Pfluog and fuck/fick? It seems extremely far-fetched, without any basis in any sourced corpus.    
  Yet another possible etymology is from the Old High German word pfluog, meaning ""to plow, as in a field"" (similiar pronunciation 
  to """"fuk-"""", the sexual euphemism being obvious). This is supported in part by a book by Carl Jung, Psychology of the 
  Unconscious: A Study of the Transformations and Symbolisms of the Libido, in which he discusses the ""primitive play of words"" 
  and the phallic representation of the plough, including its appearance on a vase found in an archaeological dig near Florence, 
  Italy, which depicts six ithyphallic men (erect penises) carrying a plow."