Natalie Haynes’ highly intelligent feature (25 February) was billed as investigating why betraying your other half was “such a major subject in popular culture”. If Haynes and her panel of talking heads never got round to defining what was meant by “popular culture”, then the range of artistic reference was commendably wide. Madame Bovary, Mad Men and Holman Hunt’s The Awakening Conscience came and went, and there were poignant excerpts from such country and western tear-jerkers as Patsy Cline’s “Three Cigarettes in an Ashtray”. Yet, whether the cultural artefact in question was a song by Destiny’s Child or a film inspired by a collection of real-life audio tapes, two contrasting views of adultery seemed to prevail. One view, cha