A man goes to a psychiatrist, and tells him, "Doc, I think I have an
obsession with sex."

The doctor agrees to examine him and begins by showing him
various drawings.

First the doctor draws a square and asks the man
to identify it.

The man immediately says, "OMIGOSH!! Four people
having sex!!!!".

Next the doctor draws a circle, at which the man gasps, and says,"One man having sex."

Thirdly, the doctor draws a triangle, which, of course, the patient
identifies as, "two woman and one man having sex".

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

To which the man replies, "ME????? YOU'RE the one drawing all
the dirty pictures!"