Dallas is one of the biggest markets there are, so there are lots of options here so you can have a taste of pretty much anything! Like most of the ladies mentioned, getting pre-screened is key and even if you don't see them the first trip, it's always good to already be screened with several ladies so if you need to make a last minute change in your entertainment or someone cancels you, you have a list of ladies you can contact that can come to you quicker because you're already in the green
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As with anything, research is key, but there are also lots of good massage parlors and strip clubs if you also want to venture out and get some variety in your trip. Either way I'm sure you'll have a blast!!