Picture Association Test

A man goes to a psychiatrist. The shrink tells him "I'm going to give you a picture association test. I'll show you a picture, you tell me the first thing that comes to your mind". The man agrees.The shrink shows the man a picture of a house, the man says "Sex."

"OK", thinks the shrink. He shows the man a picture of a car. The man says "Sex.".

"Hmm" thinks the psychiatrist. He shows the man a picture of a tree and the man again says "Sex.".

"You know," says the shrink, "you seem to be preoccupied with sex."

"Me?" replies the man, "You're the guy with all the dirty pictures!"