The Japan Business Federation (Nippon Keidanren) is worried the nation's workers aren't having enough sex.
The group recently urged its 1,632 member companies to start so-called family weeks that give employees more time for playing with the kids and having more children to reverse a declining birthrate. A survey by the Family Planning Association of about 3,000 married people under age 49 shows couples are having less sex because long work days leave them with too little energy.
In a country where people over 65 will outnumber children two-to-one in five years, companies say they eventually won't have enough workers. Japan's birthrate has been falling since 1972 and threatens to shrink the labor force 16 percent by 2030 from 66.6 million workers in 2006, according to the health ministry.