More than 90 percent of businesses offering dating and other services by underage school girls in Japan are concentrated in Tokyo and Osaka Prefecture, a police survey showed Thursday.Of 114 so-called JK businesses across the country that thrive on the use of "joshi kosei" or female high school students, more than 70 percent offered services that included physical contact such as massages or bed-sharing, according to the first such survey by the National Police Agency.Many of such businesses have hidden sexual services and are considered a source of prostitution and sex crimes. In July, the…READ FULL ARTICLE