There are no rules in Asia. And of course 'Asia' is a big place
My experience is that any massage place is expecting to give a male customer a happy ending. except of course of the super legit places (where we wont be staying anyway).
My only experience in Indonesia was in Bali as recent as a month ago happy endings and nudity were expected and paid for.
The opening price is usually the price for room and base massage, do the remainder with lady.
In KL the price was all paid to the guy at the front desk prior to the session. Had a nice line up to choose from PRC girls.
In Penang the Spa was a legit hotel spa, beautiful facility and tip paid to lady. That was great, she carried a doorstop which she used to lock the unlockable door. Local woman, nice rack..
In Singapore, tips are extra. I used a dodgy place in Little India where extras were for hk, bj, topless and sex (didnt partake). Probably the most expensive place these days.
In HK, once again, there is the opening price plus plus for extra. lots of street opportunities in TST.
In Vietnam, massages are secret with topless and hj. tip to girl. lots of obvious places but may have changed in the past four years since i was there.
In Philippines I've used venues and in-room services. The in room girl I had in Feb was P350 (AU$11) for the two hour massage to turn up ie taxi and her time. Another P500 was hj, kissing and bj. nice tits but she didn't allow sex.
In summary, a massage is you naked on the table for the length of time you pay. Massage will usually be legit and they will ensure you feel happy with that. Extras are always extra.
Happy travels
HH