most girls, if they dont post that they dont explicitly not do FS, normally give service at a higher price - if you do opt for FS though, they might not give you such a detailed massage - most 141 quality isnt that great anyway - if you were to - i would actually rather recommend u go to a straight massage palour (mayb 300 / 1 and a half hours) and go 141 (WG / HG) for ML service seperately - its better price than heading a high class saunas too... (not Db girls, cost around 1k - 1.5k for FS)
Anyway - thai massage is from what i understand oil massage - which is helping u 'push' your muscles to ease them - then push push push - will eventually also leave to oiling lil bros amongst other things leading to.. uh... other things as well ;)
hopes this helps u