The 2009-2010 season opens with the titillating pairing of The Lover by Harold Pinter and The Problem by A.R. Gurney Jr.   Both shows tell stories of the complicated and humorous things husbands and wives do to keep their marriages alive.  Pinter’s The Lover is a subtle blending of artful nuance, veiled menace and zany humor, and a wonderful example of why this British playwright was awarded the Nobel Prize for literature in 2005.  The play explores the repercussions when dull domesticity and sexual fantasy collide.  A.R. Gurney’s The Problem is a shrewd, surprising, and hilarious American take on a similar theme.