Some won't admit it, and some will but there are well known ladies that frequent TER that have spent their time hustling in casino bars.  More power to them!  In the past I've picked up my share of ladies in the casino bars and never really had a problem.  Not so much anymore, but I frequent the same locations and know bartenders and see the same ladies come and go.  I NEVER approach a lady immediately.  Watch and learn.  Keep my distance and see how she works.  It's not perfect but sometimes you can learn things by watching what happens.  When in doubt stay away.  Let her lead the conversation.  First she will make sure you aren't LE.  Then it comes down to price.  I always start the same way "don't know if I can afford you".  That will usually drive the price down without asking. Sometimes it won't. Try never to quote the first price and get specifics.

What is she drinking, is she gambling at all?  The most attractive woman I've ever seen hustling was playing blackjack in the Bellagio the first time I saw her.  I stayed occupied until she was done and when she sat at a row of slots I sat down near her and waited to see if i'd be approached...I was.  She wanted a grand for an hour, that wasn't happening.  But that is a rarity.

Anyway, if you're careful you can do okay.