One of the more interesting observations about Asian vids is the copious amount of time spent on foreplay...particularly as guys massage the outside of their partner's cotton panties, often proceeding to the use of electric toys.
Nine times out of ten the woman will respond like a grateful pet having its belly rubbed, then build to an explosive climax which, unlike our Western hellcats, always smacks of that "thank you for letting me come" attitude. Even in modern Japan, female subservience dominates the culture.
This truism is ever so present in PLA5, featuring a quartet of demure geishas who appear to have all their nerve endings attached to the outer side of their epidermis. Had they not collectively reacted to facials like they were radioactive sludge, this would be a great - rather than simply good - title.