Some massage shops will ask you to pay up front, at the desk, to the mamasan. You are paying for the room and the massage, and only the massage. Anywhere from $70-$90/hour. For this discussion, I'll call these "Massage only".
Other massage shops will ask you to pay up front, at the desk, to the mamasan, but these shops will INCLUDE the price of a happy ending (HJ), though whether nude or covered depends (on the shiftiness of the shop). For this discussion, I'll call these "Included".
Now, IN THE ROOM, you discuss with the PROVIDER (the girl actually doing the massage) what extras she can offer and at what price. As massage addict said, these are incremental in nature: $50 NHJ + $50 B2B, oral, Spanish, etc + $50 FS = his $50, $100, $150, aka Part 2, Part 2.5, Part 3. Those are totals that INCLUDE the lesser services.
AND this is why I DON'T LIKE "Included" shops. The cost of the HJ is included. However, some girls in these shops will still quote $100 for the Part 2.5 extras, or $150 for FS, forgetting, or at best, not including, the $50 already paid. Those are absolute numbers. They still want this money directly in their hand. Not all, but certainly some. To MY way of thinking, I work on incrementals, so in these shops, it should be $50 for oral. But as I've said, SOME work on absolutes, so they want $100 for oral. I just walked out of a shop today (for other reasons but also for this), where the HE was included in the shop price, but she still wanted $150 for FS paid by me DIRECTLY to her.
Yes, this is long winded, but hopefully it'll clear up some confusion. Myself, I prefer the "massage only" shops and I'll deal in incrementals with the girl in the room.
To throw a bit of mud in the water, some shops will let the girl collect the shop "massage only" fee in the room before you start and while you strip, she'll go and pay the mamasan. Others, especially if you're known, will let the girl collect BOTH the shop "massage only" fee and her service fee in the room after you've finished.