If you left your watches in massage parlour (and not somewhere else), it can hardly be qualified as a theft. I would put in the category "temptation too high to resist".
As a side comment, it looks like sudden increase in available guys in Pattaya (including in go go bars) which cannot be accidental. I attribute it to deteriorating economic situation in rural Thailand (probably as a combination of seasonal floods with recent cuts in agricultural subsidies) but this comes with a price of certain degree of desperation . Just be careful with your possessions...