Variety is the strongpoint in PPP, which runs the gamut from solos, public nudity, lesbianism, couples, and an orgy. Each sequence has its merits - the solo is artsy, the lesbians authentic, the public nudity frivolous, the couples romantic, and the orgy provides more bang for the buck.
It would be fairly useless to choose a hottest scene per se; given the breadth of selections, it's every man for himself. We can only point out that the Japanese have yet to truly embrace the pop shot, which may or may not affect your clientele's viewing pleasure. Given that most of these guys are hardly what one might call living geysers of ballistic spoo, the point is kind of moot, eh?