Answer: These toilets are for saving water when having your own well. The front is for pee and the back for sh*t. The pee just floods down without flushing. Saves water by not have to flush every time.

These kind of toilets are very rare in Sweden. We used to live in a new build area with houses build with ecological ideas. In the houses there the toilets had these kind of chair to separate the urine so even men had to sit down. Then the urine was collected in one place for the hole area and used by local farmers to fertilize their land. Organically thinking. You will find them on several houses on Kullön, Vaxholm in Sweden. FYI