It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that when Ma'iz (may Allah be pleased with him) said that he had committed adultery, the Messenger of Allah (peace and blessings be upon him) said to him: "Perhaps you only touched, or looked, or kissed." The narrator stated that it was as if the Prophet (peace and blessings be upon him) feared that he might not know what adultery actually is.
Hadith Referenceمسند اسحاق بن راهويه / كتاب النكاح و الطلاق / 653
Hadith Takhrij«بخاري ، كتاب الطلاق ، باب الطلاق فى الاغلاق الخ ، رقم : 5271 . مسلم ، كتاب الحدود ، باب من اعتراف على نفسه بالزني ، رقم : 1692 . سنن ابوداود ، رقم : 4421 . 4427 . مسند احمد : 238/1 .»