The Mistress (1982)

Karen Richards (Kelly Nichols) works in an architectural firm. Her boss, Carl Reese (Eric Edwards), wants her to move into the position of public relations. She accepts the job, knowing she may be called upon to perform some important sexual favors to close a deal. Carl invites her along on a business trip with an important associate. This is the beginning of a much more intimate relationship for them. Karen becomes disillusioned with the whole affair, knowing that she in the second woman in Carl's life. She then decides to take a leave of absence to embark on a new approach to her life.