Oralsex oder: Der Obrigkeit den Arsch hinhalten

Via Twitter und Kölner Stadtanzeiger:
On the walls of Cologne City Hall, hidden under a larger statue of Archbishop Konrad von Hochstaden, is a carving showing a man giving oral sex to himself. It dates to around 1410 and no one really knows why it’s there.

Hat hier jemand eine Idee?