Nino and Teresa Rolf have just celebrated their 20th wedding anniversary. Feeling they would like more excitement in their sex life, they decide to keep diaries expressing their most intimate and private thoughts in the hope that reading each other's revelations will enliven their relationship. Nino, who is 18 years older than Teresa, is hoping she will shed her sexual inhibitions and so he writes of bizarre sexual fantasies. When Nino discovers that Teresa is attracted to their daughter's fiance, he tries to encourage their affair by taking lewd photos of Teresa and asking the young man to develop them. The plot works but unfortunately for Nino his blood pressure rises dramatically. Teresa, thankful to her husband for liberating her sexually, expresses her gratitude by vigorous lovemaking, but her efforts have dire results for Nino!