The proportion of 15- 19-year-old girls who are sexually active rose from 47% in 1982 to 55% in 1990, and is decreasing again.

The percentage of high school students who have remained virgins has risen from 45.6% in 1990 to 54.1% in 2001.

Fifty-six percent of teenage girls and 73% of teenage boys today have had sexual intercourse by their 18th birthday. In the early 1970s, 35% of girls and 55% of boys had had sex by that age.