I'm wondering if there were any other factors that might have caused the change. I'm thinking this because a lot of people have anal intercourse and I'm sure there are others who have tried inserting other things in there too, but then there should be a wide phenomen of the feces odor in people and there isn't. Have you experienced any other odor or digestive problems in the past? I have an odor problem that I think might have been triggered by certain things I did such as skipping lunches for a year. Maybe there was some kind of odor buildup that was triggered by the insertion?