I may not be as....."aged" as some of the members here, but my ex-wife is a perfect example of causing de-evolution. Keeps my kids squeaky clean all the time. My son has asthma and my daughter has a weak immune system. None of it came about until I was out of the picture. So to help them out I take them to the woods and make them get dirty and roughed up when I see them. Makes for interesting phone calls when they go home.