My wife is from Pakse Champasak province.
Very quiet, will ask me if I am happy with what clothes she is wearing when we go out. Will not hold hands or show any sign of affection whilst in public.This is typical of her generation. Until a few years ago would not walk beside me but one pace behind.
Goes out the odd time dancing with her friends but will not stay out too long, and now takes our 14 year old daughter with her. Drinks alcohol in moderation.
Will ask me for my permission if her family wish to come to visit in Vientiane. We do have our little differences of opinion but we talk over the problem to reach a mutually happy ending.
Our daughters, 5 and 14 go to the same private school and wear uniforms, no jeans.
So all in all Lao people even younger ones are more conservative than their Thai counterparts. However,this is changing , albeit slowly, with the younger generation being exposed to western society with it's inherent problems of consumerism , expections etc.