Successful programmes, she says, provide timely, sufficient and scientific information, tailored to the needs of each age group. “ Evaluation studies have shown that sex education has an impact in delaying the age at the first sexual intercourse, in increasing the use of contraception methods and condoms, and in decreasing the levels of violence against young girls,” she says. “ The above implies the reduction of early and unwanted pregnancies, and the decrease of HIV/AIDS.” It looks at the decisions that individuals make—or would like to make, if they had the opportunity.