At the seemingly fragile age of 76, his story is the stuff of Hollywood legend Well, maybe the seamier side of the San Fernando Valley , a tale made more outlandish because it happened to a buttoned-down salary man in hyper-conservative Japan. For years, a Tokyo grandfather kept a dirty little secret from his family. Longtime travel agent Shigeo Tokuda, who resembles countless older men who ride the Tokyo subway each day, admitted to his wife and daughter that he sometimes performed cameos in small-budget films. The films play upon well-documented Japanese male fantasies. In each, Tokuda plays a gray-haired master of sex who teaches his ways to an assortment of young nurses and secretaries.