It was narrated that:
Sa'd said: "The Messenger of Allah disapproved of Uthman bin Maz'un's desire to remain celibate; if he had given him permission, we would have gotten ourselves castrated." (TR)
English reference (TR): Vol. 3, Book 9, Hadith 1848 (TR)
Arabic reference (TR): Book 9, Hadith 1921 (TR)