TOKYO — A majority of senior high school girls in Japan said in a recent survey they either regretted having sex for the first time or felt confused after their first sexual experience, survey organizers said Saturday...

...Forty-five senior high schools were polled across Japan, and 9,587 people responded. In Japan, there are three years of senior high school.

According to the poll, 39% of graduating high school girls and 30% of graduating high school boys had had sex.

Among first-year students, 15% of females and 12% of males had had sex. Among second-year students, 29% of females and 20% of males had had sex.

Asked how they felt after having sex, 9-13% of high school girls said they regretted the experience; 41-45% said they had no regrets, and 41-49% responded that they could not say...