Musnad Ahmad 1304:23

'Abd al-Samad narrated to us, he said: Hafs al-Sarraj narrated to us, he said: I heard Shahr saying: Asma' bint Yazid narrated to me that she was with the Messenger of Allah, peace and blessings of Allah be upon him, and the men and women were sitting with him. He said: "Perhaps a man says what he does with his wife, and perhaps a woman informs of what she did with her husband." The people remained silent. I said: "Yes, by Allah, O Messenger of Allah, they indeed say it, and they indeed do it." He said: "Do not do so, for the likeness of that is the likeness of a devil who met a female devil on a path and had intercourse with her while the people were looking."