Thai girls are very special to me. Strong caracter or sweet, good cook, good massage, sensitive, ironic, fun, open-minded, shy or not (but in a good way, not as extreme as japanese), straight in their talking, careful etc... and as many girl in other asian countries, they fall in love very quickly. And they can become very jealous, possessive, manipulative, crazy, sometimes agressive etc...
There's also the part of those who don't care about a tomorrow and know enjoying good times for 5 days non-stop, those are generally speaking a good english and for that reason hanging out with farangs, who besides widely take advantage on it once they feel like pimps whereas in their own country they're considered as losers for most. Of course, I'm not saying all the thai girls who can speak english are cocksuckers. It all depends where and with who you hang out !
But in a few words and it is appliable for all asian countries, you may have less difficulty to find a good and sincere girl if you get to speak thai. Cause the best ones make a few efforts in learning english, and farangs are usually lazy to try to understand them having a preference with english speaking served girls.