While browsing the board of another city I saw a provider suggest pre-screening for some of the hobbyists. Basically, if you have a girl or two or seven on your list you would like to see, then contact them to go through their screening process without actually booking an appointment. That way when the mood strikes you, booking an impromptu session will be easy. I have had gentlemen pre-screen before and it has worked out great. I never forget anyone once I talk to them. Plus, when it comes down to late night appointnments, it works out better instead of calling around to other providers in the middle of the night for a reference.
Also, late night calls are wonderful. They are like naughty games full of hot sex, good wine and cum covered faces. :_)
Kisses,
Vanica