Sunan Abi Dawud

Narrated Shakl ibn Humayd: I said: Messenger of Allah, teach me a supplication. He said: Say: ""O Allah, I seek refuge in Thee from the evil of what I hear, from the evil of what I see, from the evil of what I speak, from the evil of what I think, and from the evil of my semen"" (i.e. sexual passion)