What is the ruling on a man having intercourse in his wife's urinary opening?

Intercourse with one's wife in a place other than the womb is impermissible, as it is exclusively for the place of cultivation (the womb), based on the Almighty's saying: "Your wives are a place of cultivation for you, so come to your place of cultivation however you wish." (Quran 2:223) The place of cultivation is the womb, and the sphincter of the urinary tract is not the sphincter of the womb. It has been narrated from Umm Salama that the Prophet, peace and blessings be upon him, said in explanation of the verse: "It means one sphincter."