The Japanese live to be among the oldest people in the world because their diet consists primarily of fish and rice and other healthy things that fat Americans who die prematurely don't eat enough of, but folks in Japan aren't taking advantage of their lengthy lifespans in the bedroom: according to the World Health Organization, one in four married couples in Japan failed to make love in the previous year, while 38% of couples in their 50s aren't having sex at all. It's not that they're not interested in sex, though. Quite the opposite! Time magazine notes that Japanese demand for pornography is surging, with "elder porn" one of its fastest growing genres.