The sexual behavior of 143 boys and 137 girls aged 16 to 19 years who participate in a follow-up survey is described; they were also studied when they were 12-15 years old. Masturbation was more frequent in boys and the prevalence was higher than that of the 12-15 years period; a positive opkrion on masturbation was given by the 76% of boys and-40% of girls and a negative one by the 7,7% and 20% respectively; only one girl thought it was a sin. Contraception was thought as useful or harmful

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... erentially by boys; IUD. oral or inyectabic contraceptives and natural methods were known more by girls than boys, condoms were known more by boys. Heterosexual intercourses were considered positive or negative by 51 %and 42% of boys and by 44%and 48% of girls respectively; 54.5 % of boy and 70.8% of girls never had intercourses, a lower proportion than in the 12-15 years period; boys began intercouses earlier. The fate of pregnancies and familial feelings and reactions to pregnancy are also described. Anal coitus was done at least once by 13.8%of boys; 4 boys (2.B%) had a steady homosexual behavior from the 12-15 years period; 6 girls have, once, homosexual intercourse; most of the 280 young people thought homosexuality as a negative bahavior. (Key words: adolescents, sexual behaviour).