Pucker Up and Bark Like a Dog

A married couple become involved with a secret society catering to rich people's sexual fantasies.

A doctor falls in love with his patient, a beautiful tennis star who has just been diagnosed with a condition from which she could die if she doesn't have an operation.

Apparently a normal couple, Karen and Max are in fact agents for opposite sides of the "cold" war who have been assigned to marry each other and feed/steal intelligence. When they are both ordered to execute the other they realize that they have fallen in love.