Same story here. I think that regardless of what people want, what would probably be best is a full and explicit explanation of sex(and some sex culture education might help) at around 7 or 8 for both genders. However, if people vote to make sex education totally personal, that is the parents choice to educate their children how they want, I will be okay with it. I plan to explain the whole thing to my children very early. I don't think there is any risk that the child wont understand how to treat the information as long as I don't rely on him or her knowing common sense. As long as I say unsaid things that you learn later in life, there should be no problem with it.
Like, "Okay, sex, and all sexually related things are totally natural and unshameful, and anybody doing it is kind of heart warming and admirable, but when you are in places like school, or most public places you are supposed to ACT like you have a slight feeling of shame about the whole thing. Not supposed to talk about it, supposed to ignore and feel embarassed when others break that rule, shit like that. You can only shed that act in public and in school with people you've learned to trust."