We didn't really "prepare for the talk". Mostly it was a series of small talks as situations came up that lent themselves to it. We did buy a few books and give them to our kids, told them they could read them when they wanted to and left them on the bookshelf in their room. And I think they did read them. I suppose with grade acceleration (which we did not do), you would want to check in with the school on sex ed topics for the various age groups.