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Defecation postures
Humans use one of three types of defecation postures to defecate: squatting, semi-squatting, or sitting. People use the squatting postures when using squat toilets or when defecating in the open in the absence of toilets. The sitting posture on the other hand is used in toilets that have a pedestal or "throne", where users generally lean forward or sit at 90-degrees to a toilet seat.
In general, the preferred posture is largely a cultural decision. However, people need to adapt their defecation posture to the toilet type available to them, e.g. while travelling or if moving to another country.
==Sitting ==
The sitting defecation posture involves sitting with hips and knees at approximately right angles, as on a chair. So-called "Western-style" flush toilets and also many types of dry toilets are designed to be used in a sitting posture. One advantage of the sitting position is that it leaves little or no chance of getting fecal matter on clothes or ankles.
Toilet seats are a recent development, only coming into widespread use in Europe in the nineteenth century.〔A History of Technology, Vol.IV: The Industrial Revolution, 1750-1850. (C. Singer, E Holmyard, A Hall, T. Williams eds) Oxford Clarendon Press, pp. 507-508, 1958.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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