Re: Sitting on the Toilet - Adult Problem
Are you seeing a gastroenterologists? Unless you are, I wouldn't recommend you doing this. What I think that you are doing is trying to retrain your defecation reflex. Why? I don't know, but to maintain a healthy bowel, the urge to "Go" should not be ignored for longer than ten to fifteen minutes. After this period of time passes, the defecation reflex goes away and the urge is not activated again until the next time it is stimulated, which may be several hours later. Moving these dry stools later can involve straining which can cause all kinds of problems like anal fissures and hemhorroids, which can be very painful.
I really think that you should make sure that you are under a doctors care before you do this. And as far as where to sit? Well, the toilet would be the best as you can then eliminate like you should be doing in the first place.