Continued for detailing: the japanese guy does a brain-washing of an (always) shy girl to convince her to have sex (would not want a girl to jump on a man on command, is too easy), never girls shoul agree immediately. And they talk a lot after sex too, like taking lessons:
http://www.tokyo-tube.com/video/73/
Except the very japanese funny stuff:
http://www.tokyo-tube.com/video/7339/
... the girl will alway cry in rape style (illegal in UK):
http://www.tokyo-tube.com/video/10688/
Voyeur factor is also important, they often put fixed cam like a spy cam:
http://www.tokyo-tube.com/video/23273/ , which is less entertaining for a western, than a cameraman following action or POV really.
This scene from "Lost in Translation" is both funny and true: