Thank you. That was a very thoughtful and detailed response. It would have made an excellent post on its own and added to your growing reputation on steemit :-) As it is, it now lies buried here in a comments section. Oh well.
I think that your ideas of what would constitute "proper sex education" are spot on. Would that I had been brought up with such an education! It would have saved me much heartache, and an extraordinarily damaging cul de sac of drug addiction and toxic relationship, on my life path.
Where we might differ is how such a program of education could possibly be implemented. Being a voluntaryist (all interactions between people would be voluntary in an anarcho-capitalist or voluntarist society. A person owns himself/herself.), I am fundamentally against having such education in the hands of the "State". Except in rare cases of spiritually developed people or communities, the old adage "power corrupts and absolute power corrupts absolutely" seems to have held true throughout history. A top down approach will fail in my opinion. To succeed, implementation will spread out from small centers of conscious, intentional communities.
I also think that, unless a particular community has made other arrangements due to local conditions or aims, the first responsibility for the education of children would lie with parents. Unfortunately, there are virtually no parents left in our modern world who would be capable of imparting such an education to newly arriving little beings.
Therefore my thinking runs along the lines of small groups of people forming communities. Participants would support each other's development up to a state of having the capability to become the type of parents who could impart such an education as the one you envision.