Get yourself VIP access and start by reading some reviews. I'm sure you have an idea in your head about what you like or how you would like an appointment to go. Look for ladies that fit bill and have good reviews. You won't strike gold every time but you will know it when you do!

I want to find the lady that speeds up my heart rate just based upon her looks, and then makes me feel like she couldn't exist without me.  From there, witty conversation and great physical interaction complete the deal.

That's what it takes to get a performance 10 from me.

As for me:

I have two ATFs: one who likes to gradually build up the heat and another who is completely aggressive from the jump.  The first is amazingly beautiful and friendly, the second is pretty but shares more of my interests.  Both are incredible in bed.

Of course, it's always a combination of looks and skill but there are some details that must be considered.  Some guys like plastic while other insist on natural, some prefer certain acts [like Greek] while others do not.  Those who have seen porn stars like the prestige even though they could get the same level of service cheaper from a well-reviewed provider.

Keep reading the reviews and the boards and you'll see that there is too much variety to pin it down.

Looks gets you attracted to the lady but performance is what keeps you coming back for 2nds and 3rds.  Some ladies click with you and others don't.  It is similar to civi dating except that the finish line is guaranteed.  The only thing you don't know is how you are going to get to the finish.