When asked what her secret to appearing youthful, Shirley is quoted as saying: 'Masturbation! Sex keeps you young no matter what. The feelings of it keep you going.' Scroll down for video. Directed by Hal Ashby. With Peter Sellers, Shirley MacLaine, Melvyn Douglas, Jack Warden. A simpleminded, sheltered gardener becomes an unlikely trusted advisor to a powerful businessman and an insider in Washington politics.