That talk....

At what age do you need to start having "the talk" with your daughters? MK is still young, but I think we are going to have to do an abridged version to start giving her more of an explanation for our rules. MK is very innocent when it comes to boy girl stuff and I am so thankful for that, however, we are starting to notice that we are having to give more and more boundaries for boys and while those will still exist, I think it will make more sense to her and she will be able to use more common sense if she understands why we have these boundaries. I don't know if this makes sense, I ramble a lot in these types of blog posts. I am so hesitant to take away that innocence, honestly I am surprised that after 1 1/2 yrs in public (albeit charter, but still public) school she is still as innocent as she is, I thought she would have been exposed to much much more. I don't know. I am not thinking that she needs to know everything, but I think she needs to know something. What do you think? When did you start telling your daughter or son about "stuff"? I welcome feedback!