" When a man loves a woman, he desires union, that is, the goal of union which exists in love.
In the elemental form, there is no greater union than marriage. (10) By this appetite
encompasses all parts. For that reason, complete ritual washing is prescribed after
intercourse. Purification envelops him as annihilation in the woman was complete in the
obtainment of appetite. Allah is very jealous of His slave if He believes that he finds pleasure
in other than Him. So man purifies himself by ritual washing in order to return to Him in
whom he was annihilated, since that is all there is. "

― Ibn Arabi , The Bezels of Wisdom