I don't think the problem is whether or not to have sex education, "everybody" is for that
http://www.npr.org/templates/story/s...toryId=1622610 but what to include and how to go about it and that does make a difference and might not get covered. I think what's covered, etc. though is a state-by-state and school district-by-district thing and there's nothing in place that would "standardize" things.
I had sex ed in public high school in 1967 so it is definately being taught. It's all politics. I think it's much better for concerned parents to teach what they want taught themselves. But no matter what, you can't force people to think or believe in a way they don't. You can't legislate morality.