The Messenger of Allah ﷺ forbade a man from approaching his wife in her anus.
حدثنا عبد الرحمن حدثنا سفيان عن عبد الله بن شداد الأعرج عن رجل
أن رسول الله ﷺ نهى أن يأتي الرجل امرأته في دبرها
Its chain is daif due to the anonymity of the narrator reporting from Khuzayma. The hadith is sahih as a marfu report with the wording, "Cursed is the one who approaches a woman in her rear." It was mentioned previously at 10158.