How to Save a Marriage and Ruin Your Life

How to Save a Marriage and Ruin Your Life is a 1968 film directed by Fielder Cook. It stars Dean Martin and Stella Stevens.

The scheme is to make a play for Harrys mistress himself. David meets and courts Harrys attractive employee, Carol Corman, determined to break up her fling with Harry once and for all.Davids plan goes wrong because he has the wrong woman. Harrys actual mistress is Carols nextdoor neighbor, Muriel Laszlo. As soon as he learns mistakenly that she is seeing another man, Harry decides to give his marriage to Mary one more try. ........

Source: Wikipedia