"I said: 'O Messenger of Allah, teach me a supplication from which I may benefit.' He said: 'Say: Allahumma 'afini min sharri sam'i, wa basari, wa lisani, wa qalbi, wa sharri mani (O Allah, protect me from the evil of my hearing, my seeing, my tongue and my heart, and the evil of my sperm.)" - Meaning his sexual organ.  

قُلْتُ يَا رَسُولَ اللَّهِ عَلِّمْنِي دُعَاءً أَنْتَفِعُ بِهِ قَالَ قُلِ اللَّهُمَّ عَافِنِي مِنْ شَرِّ سَمْعِي وَبَصَرِي وَلِسَانِي وَقَلْبِي وَشَرِّ مَنِيِّي يَعْنِي ذَكَرَهُ