This man goes to see a psychiatrist and the shrink tells him "I'm going to show you some pitctures and I want you to tell me the first thing that you think of when you see them". So he shows him a picture of a boat. "What does this make you think of?" the shrink asks. "Sex" says the man. A picture of a house. "Sex" says the man. A picture of a tree. "Sex". A picture of a landscape. "Sex". The shrink shakes his head and says exasperatedly "You're obviously obsessed with sex". "Me?!", exclaims the man. "But you're the one who keeps showing me dirty pictures!".