I'm just guessing, of course.  I don't think there is anyone who has tried to see them all, so who would know the answer to your question?  I can only make two comments in confidence:

1.  If its a Kgirl, odds are very high that she is legit.  They rotate new girls through every week, so it's often a week or two before any reviews show up.  LA is also often a destination for touring ladies, so maybe there are reviews in another city and/or under another name.  You can ask when you make initial contact.  

2.  As far as legitimacy, you're going to do a lot better, percentage-wise, on CV than you are on BP.

its a gamble

hi there babe

there are so may girls and its a hit & miss !!!

good one mate.

alley

Wish I could say the same for the men who inquire

I love it when they screw up the CV ad posting and it shows up with the same pictures/email/phone number all across the country at the same time. Girl gets around!

http://www.cityvibe.com/indianapolis/Escorts/guaranteed-satisfaction/1847541