Btw this still happens in Asian and South East Asian villages, People go to nearby fields and squat on the ground to relieve themselves, the only natural way to do it without toilet. Just do this once and see for yourself. First poop the 'normal' way i.e. sitting on the toilet as you do. When you feel afterwards as if there is still something left, put your feet up on both toilet edges (balance, you can do it ) and more will come which you would have gone about without removing!
I'm not comparing its affect on acne. But it does help in removing faeces better.
@Alternativista, the apparatus photo that you've shared, in my opinion, doesn't let one achieve the kind of position you would when squatting on the ground. Your feet have to be higher than that (e.g. on the toilet edges) http://naturesplatfo...ges/pseudo2.gif