Just because a child is educated on a situation, matter, or lifestyle does not mean that they have to concur with or believe in it. Most parents believe that they should shelter their children from the truth of this matter, but I think it only confuses them more when they do learn the truth. At some point in life every child will encounter something that their parent(s) believe is distasteful or unworthy, whether it be someone the child personally knows, a celebrity on television, or the couple behind them in line at the grocery store. If you explain the situation ahead of time they will better understand when they encounter it in the real