Musnad Ahmad 962:75

Yazid ibn Harun narrated to us, Hariz narrated to us, Sulaym ibn Amir narrated to us, from Abu Umamah, who said: A young man came to the Prophet, may Allah bless him and grant him peace, and said: "O Messenger of Allah, permit me to commit adultery." The people turned toward him and rebuked him, saying: "Stop! Stop!" He said: "Bring him near." So he drew near to him until he was close. He said: "Sit." He sat. He said: "Would you like it for your mother?" He said: "No, by Allah, may Allah make me a ransom for you." He said: "Neither do people like it for their mothers." He said: "Would you like it for your daughter?" He said: "No, by Allah, O Messenger of Allah, may Allah make me a ransom for you." He said: "Neither do people like it for their daughters." He said: "Would you like it for your sister?" He said: "No, by Allah, may Allah make me a ransom for you." He said: "Neither do people like it for their sisters." He said: "Would you like it for your paternal aunt?" He said: "No, by Allah, may Allah make me a ransom for you." He said: "Neither do people like it for their paternal aunts." He said: "Would you like it for your maternal aunt?" He said: "No, by Allah, may Allah make me a ransom for you." He said: "Neither do people like it for their maternal aunts." He said: Then he placed his hand upon him and said: "O Allah, forgive his sin, purify his heart, and guard his private parts." He said: After that, the young man would not turn his attention to anything [of that nature].