As most westerners know well, ceramic toilets are designed to be sat on, even by those who are quite overweight. However, since it's customary in Asian countries to squat when using the toilet, some visitors to western countries sometimes squat on the bowl of the toilet when using it.
When sitting, a proportion of the weight of the user is supported by the legs, but when squatting the user's entire weight is borne by the bowl.
This, and at least one report of a squatting traveller breaking a toilet bowl (!), leads me to wonder about the safety of this practice. I haven't been able to find any reliable scientific discussion of this online.
How much more force is borne by the toilet when standing/squatting on it? How strong is a typical ceramic toilet bowl? Is it safe to squat on a toilet?