Sexy Lao girls are basically night girls or service girls in short skirts who work in bars, clubs and hotels. Laos is slowly but surely heading towards Thai style society except we don't have strippers, pole dancers and those sorts of things like they do in Thailand.
If a sexy Lao girl is your preferred choice then the best places to meet them are at the mentioned establishments. One thing that you might want to keep in mind when dealing with sexy Lao girls is that they are essentially there to make money. Sure, some of them would like to find love with the right guy, but for most of these girls, this comes secondary to the idea of earning a living for their families.
Also, many sexy Lao girls have boyfriends all over the world supporting them in one way or another, usually with lump sums of cash every month. If you end up supporting a sexy Lao girl that you don't really know too well then remember that there may be a handful of other guys doing the same thing with the same girl.
A sexy Lao girl can't be trusted, it's as simple as that. However, if you're just after abit of fun and you need someone to talk to, and cuddle up with for a one night stand then a sexy Lao girl is the one for you. But if you want to start a serious relationship because you feel that she is marriage material then that is the risk you take if you can change her ways.