It is narrated from Sayyiduna Talq that a man asked the Prophet (peace be upon him) in my presence: "If any one of us touches his private part, should he perform ablution?" The Prophet (peace be upon him) replied: "No, the private part is only a part of your body."
Hadith Referenceمسند احمد / مسند المدنيين رضي الله عنهم اجمعين / 16292
Hadith Gradingحکم دارالسلام:حديث حسن، محمد بن جابر ضعيف، وقد توبع