Background: Previous reports show that Chilean teenagers have an inadequate
knowledge about sexuality and reproduction. Aim: To compare the knowledge
about sexuality among adolescents coming from private and public schools, w
ith and without sexual education programs. Material and methods. A structur
ed anonymous inquiry, and containing multiple choice and open questions, wa
s applied to sample of 229 adolescents attending seventh and eigth grade of
junior school, in private and public schools of Temuco, Chile. Results: El
even percent of adolescents had already their first sexual intercourse at a
mean age of 12.2 +/- 2.4 years old. Of these, 96% came from public schools
. An overall analysts of tests, disclosed a 53% of correct answers to the i
nquiry. Adolescents coming from private schools had a better performance th
an those coming from public schools. Sexual attitudes were not influenced b
y sexual education programs. Conclusions: Adolescents coming from private s
chools have a better sexual knowledge level and more conservative attitudes
towards sexuality. Overall knowledge is inadequate albeit overvalued. Thes
e teenagers are high risk group for unwanted pregnancies and sexually trans
mitted diseases and require efficient sexual education programs.