Of course there are prostitutes all over the world. It is true that in Thailand they don't make any effort to be discreet. Maybe there are too many fighting for the customers.
There are a couple of houses near us that are rented by very wealthy Chinese and used for ( well I'd better not say). Anyway, they hire absolutely gorgeous, refined Chinese prostitiutes, who turn up aroung 9 pm. The next morning they go shopping, load all their stuff in the car that picks them up. The boot is already half full of goods from the other girls sitting in the car.
The bags are simply left out for the rubbish collectors.