Posture Aspects
The positions and modalities of defecation are culture-dependent. The natural and instinctive method used by all primates, including humans for defecation, is the squatting position. Squat toilets, sometimes referred to as 'natural-position toilets', are still used by the vast majority of the world, including most of Africa and Asia. The widespread use of seated-position toilets in the Western World is a recent development, beginning in the 19th century with the advent of indoor plumbing.
Bockus in Gastroenterology, the standard textbook on the subject, states:
The ideal posture for defecation is the squatting position, with the thighs flexed upon the abdomen. In this way the capacity of the abdominal cavity is greatly diminished and intra-abdominal pressure increased, thus encouraging expulsion ... —Read more about this topic: Defecation
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