Come, quando, perché (1969)
Directed by Antonio Pietrangeli, Valerio Zurlini

Film Synopsis

During a reception in Turin, Paola meets Alberto Pegasano, a business associate of her husband from Argentina.  Alberto wastes no time trying to seduce Paola, but she resists his advances, even though she knows her husband Marco has often been unfaithful to her.  To escape her admirer, Paola heads off to Sardinia for her holidays, but Alberto follows her and finally she yields to his unwavering attentions.  When she returns home, Paolo wonders whether or not she should tell her husband about her amorous adventure...