Our colons absorb water quite readily, it's an important part of making formed stools- the stuff that comes into the colon from the small intestine is very liquid, and the colon takes back most of the water and it is absorbed into the blood plasma. A load of pure water in the colon will also lead to some absorption in the same way. Excessive dilution of the plasma can be harmful (even lethal), but it's unlikely to be a problem in a healthy person if the water is expelled in a reasonably short time, say 10-20 minutes. Not sure about the headaches, tho could be due to a temporary increase in blood volume and pressure. The blood pressure regulation system should cope easily with the little bit of water that would be absorbed, just as it does if you drink a lot of water. The whole issue is overcome by using 0.9% salt solution (9g of salt in a litre of water). This is isotonic with the plasma and therefore it won't move from the colon into the blood vessels. How much is 9g of salt? about 2 level teaspoons. If you want to use this solution, you will have to administer it by a means other than the shower! QUOTE(sexy_ass_jewel @ Jun 14 2008, 09:18 AM) [snapback]97498[/snapback] Is that why I've been getting a headache so much? I clean out my ass usually once or twice a day with my shower enema. I wondered about absorption. I clean so often because my boyfriend always wants to fuck me in my ass and I HATE a mess. I try and stay prepared. Since I've had the shower enema, we've NEVER had a mess. In fact his dick stays so clean that he'll take it straight out of my ass to my mouth. It's a helluva turn on for both of us. But anyways, back on topic---so am i hurting myself with this shower enema?