Not all provide extras, but many do since they must pay a huge stage fee.  

And you will most definitley pay mucho $$$ for very little time. Think of about $$$$$ for about 15-20 minutes and it won't be GFE.

If I were you, I'd just go to see the show and have something lined up with a well reviewed provider.  It'll cost you a lot less, you won't be hurried and you won't feel like a chump afterward.

Just my 2 cents

AFAIK the answer is a definite "maybe" - one can drop hints whilst getting a dance, etc.  But wouldn't it be simpler to just contact a full service woman found on TER, Cityvibe, etc.?

Have a crush on a particular dancer?

Yeah sure, they work hard to take your money away while doing the minimum in terms of showing you anything.  It's a skill and not at all easy to do for us normal folks.  Takes training.