What do you need to know before starting? What should be careful? Is there even an age at which it is recommended to start? This time the Israeli guide for teenagers is dedicated to two important matters: contraceptives and sexually transmitted diseases. We believe that knowledge gives a lot of power, and only when you know - you can make the right decisions. This guide was written especially for boys and girls your age (16-18), and it has answers to all the questions that bother you (but you are terribly uncomfortable asking). Dr. Amos Bar and Tali Rosin do it again. The authors of the bestseller ``The Israeli Guide to Pregnancy and Childbirth'' are targeting boys and girls this time and answer everything simply, with humor and with a lot of common sense.