You may have heard of obsessive compulsive disorder. It is a condition under which a person has very little control over their intrusive thoughts and create little compulsions to defend against them. Well, what is it that happens to your mind when an image of a rock hard cock pops up without an invitation? What are you going to do to fight it? Are you going to keep telling yourself you don't get excited about it... or are you going to stroke. My voice is just so very convincing...