The safest way to have sex is "double Dutch" - using both a condom and another form of contraception, such as the pill. The condom protects you against sexually transmitted diseases. The other contraceptive, such as the pill, is to make sure you don’t get pregnant, because a condom isn’t 100 percent effective. See the section on birth control.
If you don’t get blood or sperm in your mouth during oral sex, you don’t run the risk of catching HIV. But you can still get other sexually transmitted diseases, such as herpes.