I have only seen a few providers.  I would like to avoid providers that have pimps because I believe that these guys or women exploit the escorts more often than not.  What are some of the signs that a lady is being pimped?  I like to hobby but I don't want to be involved with someone who is being forced to do something they don't want to do.

especially if you stick with the independent gals, though most people do not regard the agency model as pimping per se, but some do

she is not being forced to do this.  I would also guess that younger gals would be more likely to be pimped.  However, many gals use a booking agent, or assistant, to set up their dates and do their screening, leaving them more play time.  I assume the assistant gets a small portion of her fee as payment for doing the behind the scenes work for her.