Kids are beoming sexually active at a younger and younger age and its scary!! When I was younger I didnt even know what half the stuff was that kids are talking about today. It's ridiculous that kids are rushing into sexual relations because everyone else is. They arent thinking and unknowingly ruining their reputations when they grow up a little ("eww, remember that girl, shes a slut" and etc.). You don't want that.
As much as kids think its cool and grown-up, its not. Sex is a mature and grown-up act, it needs to be treated carefully and responsibly! Kids need to learn not to rush into things, talk with their parents, teachers, or doctors and find out all the information (because, believe it or not, the kid you sits behind you in math does not know everything there is to know), and they need to know its ok to wait.
If kids feel they are ready, they need to know that their is a risk of consequences such as disease, pregancy, etc. This is why I tell all my siblings they can always talk to me about anything becuase I would rather have them find out what they need to be safe, then to do things in secret and suffer consequences they could have avoided.
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I recently (6 mos ago) read an article about "gel-snaps" For the uninformed, these are colored, semi-elastic bands that young girls, some as young as 8 and 9 y.o. wear on their wrists and fingers to school and tweener social functions. The game works like this:
Each color denotes a particular sexual act. If a girl or boy (mostly boys) snap a band off of a finger, then the girl must perform that act. The acts range from a french kiss (straight or lesbian) to full intercourse.
My suggestion;
If you see a girl (with a parent) wearing these bands, snap one off and challenge her to tell the parent what it means.
Comprehensive sex education is the only sex education that can actually be called that, in my opinion. Kudos for being a mentor to your siblings - they'll thank you for it eventually. I wish everyone had such a matter-of-fact view about educating our youth.