опять двойка

[ana_pirogova]

Visitors to the Winter Olympic facilities in Sochi, Russia, have encountered twin toilet cubicles, many for the first time.
Just don't use them for fishing
One of the least expected images to emerge from the Winter Olympics in Sochi has been the double loos – yes, side by side like thrones – spreading across social media in the weeks before Friday's opening ceremony. It surely gives a whole new meaning to going for a number two.

Вот здесь опять надсмехаются над загадочной русской душой и над попытками объяснить феномен.
А я так и не пОняла, почему их два?