An enema is the procedure of introducing liquids into the rectum and colon via the anus. This would come under the umbrella term of medical play in BDSM context, where it is also known as Klismaphilia.

The increasing volume of the liquid causes rapid expansion of the lower intestinal tract, often resulting in very uncomfortable bloating, cramping, powerful peristalsis, a feeling of extreme urgency and complete evacuation of the lower intestinal tract. An enema has the advantage over any laxative in its speed and certainty of action, and some people prefer it for this reason.

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