Finally, the sisters' parents, Mona and Lenny, are separating after 40 years of marriage, but will not get divorced. Lenny (Ben Gazzara) is bored with his marriage, but does not want to start another relationship; he simply "wants to be alone." As Mona (Louise Lasser) copes with being single during her twilight years, Lenny tries to rekindle his enthusiasm for life by having an affair with a neighbor. It is no use, however, as Lenny eventually finds that he has become incapable of feeling. The only person who seems happy at the end is Billy, who throughout the film attempts to make himself ejaculate and finally succeeds after masturbating to a sunbather in a bikini.