Ewww. I mean, nyotaimori (literal translation: woman's body as a plate) in which men eat sushi off of a naked woman is one thing, but this... yikes!
One of the problems with a culture that traditionally has made such sharp distinctions between "honne" (true feelings) and "tatemae" (social expectations) is perhaps these sort of really strange fetishes. Follow the line all day long and at night you get to do whatever (literally!) the hell you want.
In my experience, the man in the office who is the most boring, strict, stick to the plan guy in the office, looks like he doesn't have a fun bone or joint in his whole body, is the first to have his necktie around his head and the first to be feeling up the secretary at the obligatory nomikai (drinking party).
