All these responses suck.
Here's some tips from someone who has actually done this: use a review site.
http://www.liveescortreviews.com/
Use ad blocker. Don't bother with any that don't have at least 4-5 reviews on TER. Check the actual reviews. Once you arrange a meet do NOT hand the money directly to the slut. Place it nearby and let her pick it up.
That being said, don't fucking bother. You're paying for a very, very used hole from someone that just sees you as a customer and will have a bunch of rules about what you can and can't do.
Without any actual intimacy you may as well just fap.
http://www.amazon.com/Tenga-Easy-Beat-Egg-Masturbator/dp/B002DE6SWA
There. 1000x cheaper.