Burnt By A Scalding Passion(1976)

Original title: Bruciati da cocente passione

Virginia and Casimiro are both married with children to passionate spouses, while they are shy and devoted to poetry, crying watching "Anna Karenina" on TV. They commute every day from a little town in Lombardy to Milan and during the journeys they meet and fall in love. They suffer from being unable to realize their love without hurting their marriages but they don't know their respective spouses share a hot relationship...