Sayyiduna Sa'd bin Abi Waqqas (may Allah be pleased with him) says that Sayyiduna Uthman bin Maz'un (may Allah be pleased with him) intended to withdraw (from women into celibacy), so the Prophet (peace and blessings be upon him) forbade him. Had he (peace and blessings be upon him) permitted it, we would have castrated ourselves.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13462