Sayyiduna Talq bin Ali (may Allah be pleased with him) said: I was present with the Messenger of Allah (peace and blessings be upon him) when a man asked him (peace and blessings be upon him) a question (it seemed he was a Bedouin). He said: O Messenger of Allah, what do you say about a man who touches his private part after he has performed ablution? He (peace and blessings be upon him) said: "Is it not just a piece or part of your own body?"
Hadith Referenceالمعجم الكبير للطبراني / باب الطاء / 8212