Thought I'd put in my two cents here from Indianapolis. I have multiple posts of detailed "massage" encounters here in the circle city - some more successful than others. But if you read them, you can learn something from every experience (As I have).
In general, I've found that going right for the respectful finger dance up her leg will take all the mystery out of your experience. More than leaving money in site or cryptic hand motions, you'll know in a hurry what's up. Some here will not discuss anything with you untill you touch them between the legs!
They're used to it and you will not be insulting them. If you are upfront, straight and respectful of them, you'll both have a better time. Also, I always respect their wishes as to what they will or will not do. I do not push, but rather enjoy the experience. At any rate, you may even get a good massage out of it!