Illicit Sensations (2000)

Robert is a successful architect who sleeps with every woman he meets. His wife Michelle can't stand her husband's infidelity and hires a private investigator to have solid proof of the affairs. But as the private investigator supplies her with the material to ask for a divorce, he and Michelle also start an affair of their own. As Michelle confronts her husband he promises her to be faithful if she remains with him. But the private investigator in love with Michelle and the secretary in love with Robert still have a role to play in this.