More than 40 percent of married couples in Japan say they have sex less than once a month, with the figure rising in surveys since 2004, a doctor at a clinic belonging to the Japan Family Planning Association said.
The ratio stood at 41.3 percent in the survey of 1,306 people aged between 16 and 49 conducted in September. The figure was around 32 percent in 2004 and topped 40 percent in 2010, Kunio Kitamura, the doctor, said Thursday.
Among men, 28.2 percent said they were not interested in sex because they were "tired from work," the survey said. Among women, the largest segment, at 23.5 percent, said they find sex "troublesome."