I've never done this in Japan but once in Thailand. All I can say is that it's a lot of fun but make sure you have a plan before you go in. If you're expecting the two of them to lead the way then you'll be disappointed because there no guarantee that the two girls will have chemistry with each other, and it's much more likely that you'll need to direct things yourself, as it were. That may be a turn-off for you. And considering how much you'll need to spend (especially in Japan), you'll want to get your money's worth.