X Marks the Spot

A man goes to a psychiatrist and tells him, "Doc, I think I'm obsessed with sex."

"Well, let's do a few tests," the doctor says. He draws a square on a piece of paper and asks the man to identify it. The man immediately says, "Sex."

Next the doctor draws a circle, which the man again identifies as "sex." Then the doctor draws a triangle, which, of course, the patient identifies as "sex."

The doctor puts the drawings away and says to the patient, "Yes, I believe you have an obsession with sex."

To which the man replies, "I'm not the one with the obsession! You're the one drawing all the dirty pictures!"