I would think it is a great gadget for cleaning up. I would be really careful though about the force of the stream, force enough to get the water inside the anal canal. I actually read of a case report last week of a man who gave himself an anal fissure doing just what you are describing.

jr2 wrote: I actually read of a case report last week of a man who gave himself an anal fissure doing just what you are describing.

Well... the sure oddity of it is... the pressurized water actually relaxes my sphincter muscle. Go figure. That was the whole thing that led to what I described. I just happened to have it relax my sphincter and then I could feel the water inserting itself.... from that then came a small explosion as what was in came out. Worked charmingly, but I have to admit that it belongs in a Ripley's Believe it or not strip to be sure.

As long as the water has a chance to exit, and the pressure isn't too high. Your colon can fill up like a balloon, it can rupture.
I think as long as the actual object that is spraying isn't actually inserted into you... and the water isn't to forceful... you should logically be fine but none of us are really experts more so experimentalists like yourself. However i can see how it could help, direct water flow to that area would do a great deal to relaxing it, cleansing it, relieving any itch or irritation, and if left long enough actually numbing it... Constant stimulation of the nerves will actually numb them for a short period of time... If you've ever left your arm under a warm faucet for awhile you'll notice this effect.