I know what you're talking about, but coming to perb and doing your research will help. I personally found trouble with SPs with no positive reviews, they tend to say they offer dfk via phone or text and it's a different story at the door. I'm 30, show up fresh and like to think I'm easy on the eyes.....so the best you can do is look for positive reviews or cross your fingers. It's a sketchy business.
Anyways, here's my list of great ladies for DFK:
Leighxox w/ excellent overall service w/ bbbj
Soleil w/ bbbj and mediocor full service
Sonya w/ bbbj however do your research on this one, alot claim she's on the no fly list, however she offers a great session if you steer it safety first
Juicy Jess w/ bbbj great session if you're into milfs
I'm at work and drawing a blank on 1 or 2 other great dfkers. I'd love to hear what others recommend! Cheers