I have multiple sclerosis and I suffer from incontinence as a result, especially night time. One way I have of dealing with this is by sticking a finger in my rectum every night and moving pieces of feces around, which helps me excrete it. Also, when I defecate, I generally urinate. My girlfriend, a medical school student, thinks that if I keep on doing this, the muscles in my bowel might stop doing there job, and I’ll have to do this for the rest of my life, all of this being speculation on her part I might add. Is there any truth to this?
Here is a site about Bowel programs used by spinal cord injured people.
Hope it helps answer your question.