uummmmm sex IS a spark as @steelfirehawk said. Advertising does influence our young, but our children are as smart as us AND chat, compare and logic better than us "adults" @Cunt-Fistula, @steelfirehawk , @wbpoet , @TheGoldenMole ....when was the last time you attended high school? Kids figured out sex a lot faster than I would believe, but yes a strong set of values is needed. As i have learned, teaching your own kid about sex is....embarrassing and humbling. I thought our child would as for the <ahem> sticky mechanics of sex, they didn't. I thought we would have to show a nude body, it didn't matter to our kid.
What we all need to try.....is not be so over-protective of our kids, make a concrete Universal school class that teaches abstinence AND contraception equal. We have to give women the freedom of their reproduction/sex choices...I mean, come on, charge a pregnant woman with Murder for getting rid of her fetus, because her boyfriend is abusive or the child will born addicted to street drugs! Yes, it's a life, but so is spilt sperm.