hi bro neo6280,
as your question is quite a wide one, you can try to search this forum for threads on 'saunas'
under the china report sections. tons of info and reports available (including zhuhai saunas).
you will most definitely be enlightened
just to give you a quick rundown, generally most hotels in guangdong have a SN located on
the premises. most of the time, you get quoted a price (inclusive of the room fee) for a 2 hour session with a girl of your choice. thats the very basic idea.
read through the forum and you will know. if you can't find the info you need, then post it up
and the collective experience of all the bros will help out