His first major post-war work was Shōshō Shigemoto no haha (Captain Shigemoto's Mother, 1949–1950), which includes a restatement of Tanizaki's frequent theme of a son's longing for his mother. The novel also introduces a new theme, of sexuality in old age, which reappears in later works such as Kagi (The Key, 1956). Kagi is a psychological novel in which an aging professor arranges for his wife to commit adultery in order to boost his own sagging sexual desires.
