Well sleepy1 I have asked the same myself, I imagine it would be a very strange sensation, I have been watching a few episodes of The Spa of embarrassing illnesses, and everybody there is having this colonic irrigation done, only here they have something pumped up their colon (Putting nicely) and you can then see it actually being sucked out as it through a glass vessel on a machine. They all seem to feel a lot better afterwards!! But the stuff that comes out is a bit grim, great big long chunks of stuff strung together!!
I would be up for it!! not sure Im into having anything stuck up there though, its always been strictly exit only!!
Well apart from one doctor who got a bit previous with a rubber glove and some KY :-( that brought a tear my eye I can tell you!!!