I didn't say that adolescents should be encouraged to have sex, only that they should learn about sex. That may help them to avoid unintended consequences of unsafe sex like pregnancy or STDs.
It's the reverse. Since the 60s and 70s and all the safe sex programs, we have far higher rates of STDs and abortions than ever before. When you tell a kid that, as you say, "Nothing is 100% safe but a hand job is safer than oral sex, oral sex is safer than intercourse, and intercourse with a condom is safer than unprotected intercourse," you are implicitly saying: Stay safe. Go out and give hand jobs and oral sex. All the articles mention that girls are giving oral sex so much because they've been taught that it's better and safer than intercourse. That is true. But it's ill-serving those girls.