Aneros use and abdominal discomfort.

I have had this problem and was worried that maybe I might be doing myself some harm. I have thought about it and I think possibly not. Little pains in the lower abdomen after the sessions may well be common. These can go on for a short time or even a whole day. I think there may be two main reasons for this. 1. Some lubes tend to encourage the building up of wind in the region and this can get trapped . Sooner or later it "blows out"..farts... don't laugh, and the pains go away. 2. One of the consequences of aneros use, are the very pleasurable contractions and the related pleasure waves that follow. These seem to be caused by the muscles in the anal and lower abdominal area tensing and relaxing. doing this for long enough may result in a little soreness and pain. I think this will pass with time and hopefully no harm done. Any ideas on this? Tomasheen.