The Messenger of Allah ﷺ was asked about touching the penis, and he said, "It is merely a part of you."
حدثنا عمرو بن عثمان بن سعيد بن كثير بن دينار الحمصي حدثنا مروان بن معاوية عن جعفر بن الزبير عن القاسم
سئل رسول الله ﷺ عن مس الذكر فقال إنما هو جذية منك
[Its chain is extremely daif] Busiri said, "This chain contains Jafar bin Zubayr, and they have unanimously agreed to discard his hadith and have accused him of fabrication."