The "hijab sexy" got me thinking: Do the Indonesian hookers you've seen wear hijabs?
Heck no, they dressed normally - casual western clothes. Thai working girls often wai Buddah images or other shrines that one encounters while walking to the short-time room. This sort of thing is normal.
Also, another interesting tradition - also on the way to the deed: if you are taking a girl from a bar (as opposed to a freelancer), her bar-mates will all run up to her and she makes her hands in to fists, and the poke their index fingers into her fists, making a pantomime of fornication. This is meant as 'good luck in your fornication for money' and 'I wish you good luck in hopes that your good luck in getting a customer will rub off on me'.