Arthur Schnitzler described Reigen, his loose series of sexual sketches, as "completely unprintable, " and indeed its premiere in 1921 spurred an obscenity suit. It was only when Max Ophuls made his famous film in 1950 that the work became better known as La Ronde. Now David Hare has reset these circular scenes of love and betrayal in the present day, with a cast of two actors playing a succession of characters whose sexual lives enmesh like a...