In Jeff Koons: Diary of a Seducer, imagine... enters the world of one of the most successful, controversial and downright odd artists of our time. His gigantic balloon dogs and even bigger flower puppies havebecome iconic. His rows of virgin vacuum cleaners are frozen in time. Michael Jackson sits with his pet chimp Bubbles.But the artist who celebrates the commonplace and has put sex and the banal on a pedestal has mined some dark territory. Is it playtime or parental guidance recommended? As Jeff Koons' first retrospective takes over the Whitney Museum in New York and the Pompidou in Paris, imagine... asks what lies beneath the shiny surfaces.