Data from the Child Health Institute research centre shows 47% of boys in their third year of lyceum, at the age of 17, are sexually active.
Boys having sex during their first year of high school at the age of 12 is relatively low at 2%, but rises to 13% in their third year and in the first year of lyceum, reaching 47% by their final year.
Among girls the numbers are significantly smaller, with 0.8% having sex at the age of 12 and 2% between the ages of 14 to 15 and 26% by the age of 17.
The findings indicate that teenagers are neither informed nor prepared regarding sex education, which means that they risk contracting sexually transmitted diseases or having unwanted pregnancy.
Research showed that another significant problem in teenagers is smoking, as 30% of children in their senior year smoke, up from 10% in the third year of high school.