This is a film about life, it does have some erotic moments, but it not just about erotism, if you watched it just for that element I suspect you would be dissapointed. The sex scenes are emotionally charged but at the same time quite funny in a very charming way. It sometimes has the subtleties of an arthouse French film and touched on things totally unexpected from a Japanese film -such as the main characters failure in his work, marriage and general success in life, polar opposites to the typical Japanese achievment ethic, this shows a different side of the Japanese character, one that is perhaps born of the strange world of recession the Japanese have recently found themselves in.
The tramp - the main characters friend and confidant - is a wonderful sage character and has some terrific observations on what is the mad world we all find ourselves living in. He sends our hero on a search for hidden treasure, and he finds a girl, a girl with a very odd problem of the H2O variety this is where the kinky sex comes in, which at times is absolutely hilarious. He comes to her in search of treasure an almost mythical golden Buddha hidden in the house by the red bridge, he doesn't find the Buddha but much much more.
This is a feel good film, but not in a cheap obvious way, watch it and learn something about life and terrific film making.