Keep it under wraps
It is illegal for a foreigner to have sex with a Lao person, unless they are legally married. If you plan to, you risk being deported, or worse--spending time in a Lao prison. It is not unheard of for police to participate in extortion schemes where unsuspecting tourists are caught with a woman in their guesthouse room. Better not risk it, or make sure you know whom you are going home with after a night at the disco.