Unfortunately far too many of those looking for wives end up with former prostitutes here in Thailand. For the most part, your normal 'good girl' here in Thailand can't speak English very well and is quite shy. They will stay away from most foreigners. Those who usually gravitate to them are usually women that have had experience in the bar scene.
If you think you are going to come to Thailand on a vacation and meet some sweet innocent princess and get married, you are 100% wrong. It is not going to happen. If on the other hand you want to move here, learn about the culture, language, etc... you will find a nice charming lady. I did.
How are they doing in controlling AIDS? A few years back the incidence of new cases in Thailand was astonishing.