I don't think this conversation with a child is about what some might think it is. You will notice when you teach another adult about romantic satisfaction for the first time, you will see a message saying something about since they did not get taught this when they were younger, it might take a while for them to be able to become a romantic sage. That trait slows romantic decline. So my interpretation of teaching someone about romantic satisfaction is basic courtesies like not cheating, doing stuff together and remembering to not neglect showing your loved one that you think about and express lovingness frequently. My sim talked to his child about this and then I forgot about it. After time went by, I got a wall message saying that the child had gained the romantic sage trait because of him being able to see what a good relationship was all about. I don't remember the message verbatim but that was the gist of it. The trait will not do the child any good right now, but it will later because of him having seen his parents as positive romantic experience role models. There really is not anything inappropriate about this other than maybe the wording could be different.