John (retired in crete) mentioned it in his thread and I thought it mattered in view of the sustainable energy topic since as you know, because you read all about this, in combination with a waste water/purification installation which produces hydrogen, provides energy from absorbed energy (food).
Are you still with me?
A "faeces unit" fixed to the toilet outlet in combination with a toilet shower. The faeces are pulverized and pumped away in a 50 mm drain while the shower cleans your bottom the only hygienic way I know of; with warm or cold water. A combination with the possibility of warm air to dry the posterior is possible. You can even have it combination with an air extraction. Not a single peace of paper is used which means no unhygienic waste bins etc.. This is an existing known and proven technique. You can find it in any house in the Islamic world.
Think of it. Just sit down, and when you're ready you just pull up your trousers and off you go.
For info: mail me a pm.
It would do great in Crete too, and in combination with a small solar driven waste water/purification installation that produces hydrogen and drinking water as a by-product, you've created your own little "one family sustainable energy solution".