After finding out she does FS, BBBJ and is not a clock watcher, normally who I email or call is based on the following criteria:

Reviews- must have at least two by a trusted and reputable reviewer
Looks- We all have our taste
Price- I am not going to pay more than $$$$$ for an hour anymore
Incall/outcall: If she only does outcalls I am not going to see her

If she responds within the day I usually go with her. If I dont hear back within 24 hours I go to plan B or call up a girl I have seen before and I have her direct number and set something up for that day.

Rarely have we not been able to arrive at a time and date for the visit. In the event that the only available date and time was more than a week off I would still make the appointment because I want to see her. If I decided that I'd like to see someone sooner I would schedule an appointment with another provider in the interim. Again only contacting her or going through an agency I frequent. I rarely do same day visits. If I decided to though I would call that agency. Even if I'm interested in seeing someone new I only contact her.

When I decide to see someone new it's because she has done something to get my attention. Her photos or posts catch my interest and then I do some research. If her posts are what got my attention then I check out her photos. I then look at services offered, her website, her reviews, and donation amount. If it all works for me I contact for the appointment.

however, i have a standing rule to never meet someone that i haven't met face-to-face, usually at a meet & greet.

and, after face to faces at the m&g, i usually send out emails to the ladies i met, saying how great it was to meet them, etc etc.

further flirting and inquiries as to rates & etc. may follow up.

but when i am ready fora session, i only email one at a time.  

i know it's silly to have "standards" in this situation, but i don't feel like double dipping, or like getting one girl ready to date only to drop her in favor of another one.

i'm a gentleman, even if i'm a lying bastard lol!

If I'm traveling and trying to set something up on the road I will use a good local agency as plan B.  I've never been very good a juggling two or three possibilities.

When an email is sent, it's an indication of interest.  It's a signal that I am interested in you based upon an initial round of due diligence based on your appearance, sessions, reviews, and rates.  For me, at least, there is no commitment to a firm time and date--only an indication of interest and a request for a little more information.

Once I get responses, I will narrow it down.  Sometimes a girl will take forever to get back to me, and that could mean that she isn't interested.  For example, I emailed a very high-end provider that required a 25% deposit and charged $1000/hour.  She responded by saying, "See my form on my site."  I asked her a follow up question about how the deposit worked and what methods of payment were.  She never responded.  Sent another email inquiring if she was still available on those dates.  No response.  So I will never correspond with her again, because she clearly had no interest in seeing me.  No harm, no foul.

Other times it ends up being that a girl is so vague in her response that it's like pulling teeth to get a response.  Those are also likely to wind up in the trash bin.

With regard to choice, my criteria goes in this order:

1.  Appearance
2.  Session quality
3.  Rate
4.  Intangibles, such as how well we click on email and on the phone.
5.  Specials

Since I usually confine my hobbying to my business travel, I have the luxury of knowing way in advance when I will be visiting a particular city. I do my research, primarily on TER, and when I have determined my first choice, either email, PM
or contact that one person through perf411. I usually need a few emails back and forth to reassure myself but once that has been established, I request the date and can set off on my travels knowing that i can add this one "extracurricular" meeting to my schedule.

I usually have the luxury of planning ahead of time, so maybe that makes it easier for me, but I just do one at a time. I will usually email 2-3 weeks ahead of my trip, after doing my research.
If I do not hear back within 2-3 days, I will contact the next girl...
That will usually give me enough time to contact 4-5 different girls. Of course, it's always good to have a plan B and be ready to contact a reputable agency, as those can usually help accommodate requests at the last minute.
The way I look at it, double booking not only screws up the provider, as she could have made an appointment with someone else, but it also screws us guys up, as the girl you want to see might say she's not available due to someone double booking, and then canceling at the last minute on her.

Seems as though you are all upstanding citizens of this community. But I have to wonder if all of these fine gentlemen who have responded to my question are the exception to the rule.
I can certainly say that those who only email one lady at a time are more of my type
of client. I give respect and expect the same in return. I like to plan in advance and go out of
my way to make sure we are both comfy with the date. I never cancel and treat each client as
a friend and potential long term client.
So, to the gents who have posted an answer to my question:
Thanks so much for your input and I hope our paths meet in the future.

Kisses, RR

When I will be visiting a city (usually Vegas) - I will e-mail one lady at a time. Hopefully I have enough lead time to give her a couple days to reply.

I admit to e-mailing around 5 ladies one morning. I was in desperation mode after a lady cancelled for that evening. In the e-mail I did explain to the providers why I was requesting a date for the same day and that I was asking a few ladies. I eventually selected one and replied to the others that I had chosen someone.

Let's face it, for every inquiry, only a minor percentage will actually respond in a timely fashion.  In my initial email I try to provide all the information I feel is needed to introduce myself and  pass security.  I also specify a day and approximate time, usually two or more days in advance.  These days I usually get a automated response, and may not hear from the actual person until after my requested appointment is long past.  With two or three inquiries, it becomes more probable that I will really get a date.


Hands.

Hello Rachel,
Great question.  i email only one at a time for a specific date, and location.  I initially do some research such as availability, very important since my windows of opportunity w/ work and such limit my time. price is subjective...you get what you pay for is my philosophy on this issue, Next reliable reviews, websites, and location. incall/outcall availability really depends on situation.  So for myself i have two of my three july dates filled so far, and am looking for my august availablity, and possible dates.  one for instance is a tentative get together depending upon when a certain provider returns to our fair city.
That being said there have a few times I am horny as all hell and would like to see a provider the same day. usually later in the day, I will usually call or email a provider....if they don't answer in say about 2-3 hours, i move on to another provider.  I must say if you are looking for provider on short notice, please qualify it your initial contact. Don't waste the ladies time.

If I need to apply a multiplier, I'll post an inquiry on the board requesting who is available when.  To date, this tactic has been successful every time I've done so.