/jp/ - Otaku Culture

Yesterday i saw a short documentation about toilet paper.
They sayed that American paper is thinner than European because Americans make balls while Europeans fold the paper.

Then i was thinking about it.
On the whole world they have different ways to clean the ass. While we westeners use paper, Turkish people often use theire fingers (fact) and persian people use towels.

Now i wonder how Japanese people clean up the ass. Anybody know ?