> http://mdn.mainichi.co.jp/waiwai/0307/0706flagellation.html
>

From the article:

[begin]
Neighbors say the man was generally
quiet, but occasionally weird sounds
would emanate from his apartment.

"You'd hear an 'Ouch!'" one neighbor
tells Gatsun! "followed shortly after by
'Oh, but it feels so good.'"
[end]

Are Japanese walls typically this thin?