The DVD box of a pornographic film starring Shigeo Tokuda, left

Besides his glowing complexion, Shigeo Tokuda looks like any other 74-year-old man in Japan. Despite suffering a heart attack three years ago, the lifelong salaryman now feels healthier and lives happily with his wife and a daughter in downtown Tokyo. He is, of course, more physically active than most retirees, but that's because he's kept his part-time job  as a porn star.

Shigeo Tokuda is, in fact, his screen name. He prefers not to disclose his real name because, he insists, his wife and daughter have no idea that he has appeared in about 350...