that the Prophet said: “Allah will not look at a man who has intercourse with his wife in her buttocks.” (Using translation from Ibn Mājah 1923)
عَنْ رَسُولِ اللهِ ﷺ قَالَ «لَا يَنْظُرُ اللهُ يَوْمَ الْقِيَامَةِ إِلَى رَجُلٍ أَتَى امْرَأَتِهِ فِي دُبُرِهَا»