some of the nicest people i have met are " prositutes" and would trust them more than a lot of people here in the UK. the drugs thing is tosh- yes there are drugs surrounding prostitution but a lot of girls wouldnt dream of touching them- the same as in a "normal" enviromentthe same as some unfortunatly choose to go down that route
interesting you quote the failed marraiges an in particular thais
there is a big difference between thais and filipinos
thais are brainwashed from a very early age to think that thailand is the centre of the universe and everywhere else is a poor 2nd and everyone else espercially "farang" is worse than 2nd class. therefore take a thai girl out of thailand (also a lot of other cultural issues ,dont get me wrong) and generally they dont adapt very well.
the filipinas -again generally -want to get out of the country/poverty and are happy to relocate
if you could see any figures i would guarantee that western/thai marraiges would have a lot higher failure rate than western/pinay ones