Tinto Brass, one of Europe's masters of softcore eroticism, directed this examination of the joys of infidelity. Diana (Claudia Koll) is married to Paolo (Paolo Lanza), but while she loves her husband, she often finds herself tempted by other men. Rather than keeping her affairs a secret, Diana shares the details with Paolo, and the mingled excitement and jealousy keeps their relationship hot. However, Diana begins to wonder if she's gone too far when she becomes involved with Alphonse, a writer who worships Diana's derrière. Paolo is convinced Diana has crossed the line, and in a huff she goes on a tear with the help of her sisters. Is it too late to save Diana and Paolo's marriage? Cosi Fan Tutte was released on home video in the United States under the title All Ladies Do It.
by Mark Deming synopsis