If you are referring to the Marriott also known as The China Hotel right across the street from the OLD Canton Fair grounds, then you are in luck!! During the Canton Fairs (April and October) this hotel is loaded with talent -- girls come from all over the country to work in this hotel during 2 months of the year. To find them, take the stairway on the RIGHT SIDE of the front desk in the lobby downstairs to "The Catwalk". They will likely have a very good Filipino (or Thai) band playing and the bar will be loaded with top-notch talent. One problem will be getting the girl up to your room -- as the hotel security will ACTIVELY keep the girls off the elevators after 10 or 11 pm. With this in mind, I suggest picking a winner before then for a short-time, and then if this goes well, just have her stay the night -- she will likely give you a good rate to avoid having to return downstairs. (And because your room is much more comfortable than hers!) Otherwise, after 10 or 11 you will likely need to go to the girls apartment. Some of these are OK, and others are terrible. I have done this 3 or 4 times over the years, and each time was OK, but perhaps I just got lucky. I have taken the early-evening trip to my room far more often, and each time it was very good or better. You can also easily exchange #'s and arrange earlier meetings the following days.
NOTE: IF you take the stairway to the left of the hotel front desk, you will go down to what in the past was a Hard Rock massageplanete -- it has been closed since SARS hit a few years ago, and the last time I checked there is only a bakery and Starbuck's down on that side and you will be unable to locate "The Catwalk".
Cheers!