I've been seeing a one particular girl fairly regularly for a couple of years now. It wasn't my plan when I started punting as I sort of assumed the point was to see as many different girls as possible.
I wouldn't say this girl is the best looking I've seen or even the type I'd normally go for, she's mixed race slim with small but pert boobs and in low/mid 30's but her service,skills and professional attitude have won me over.
I have punted with some other girls who have caught my eye. You know the story, bodies to die for in their 20's with profiles full of promises but I often come away feeling a bit short changed as they very rarely live up to their hype. And I usually end up wishing I'd spent my hard earned on my regular girl.
If you do stick to one girl it's important to pick one with a professional attitude. My regular is a lovely girl with a good sense of humour and great to talk to so it would be easy for a silly old sod like me to get too attached but she is able to keep it strictly business without losing that personal connection. This to my mind is the sign of an excellent working girl.