کون‌مرزی

Inherited from Middle Persian [Book Pahlavi needed] (kwnmlc /⁠kūn-marz⁠/, “Sodomite: sodomy”).

Or perhaps from کون (kun, “ass”) +‎ مرزی (morzi, “having sex, fucking”). More at مُرزیدن

کون‌مرزی • (kun-morzi)

1. (archaic) anal sex, sodomy

   Synonym: آمیزش جنسی مقعدی

   Synonym: کون‌کنی

• Dehkhoda, Ali-Akbar (1931–) “کون‌مرزی”, in Dehkhoda Dictionary Institute, editors, Dehkhoda Dictionary (in Persian), Tehran: University of Tehran Press
• MacKenzie, D. N. (1971) “kūn-marz”, in A concise Pahlavi dictionary, London, New York, Toronto: Oxford University Press, page 52