And haven't had a hooker "wig out" on me yet.

But the types of things I'm asking for are not specific sex acts either.

So FWIW if you are going to ask her if she will perform a certain type of sex act...some won't have an issue discussing post screening.  Others will.  Don't be surprised either way  

I don't want to wait till I meet her to find out if she'll play the way I want to play.  As I suspect is what you're alluding to.  There's also ways to ask about specific acts...but probably NOT in emails or texts.  I assume you know how to use a phone?

And the types of games I like are rarely...if ever in a review.

in her reviews.  If it wasn't mentioned in any of her recent reviews, then she probably doesn't do it.  If you are a fan of BBBJ and the reviews say CBJ (even if the profile says BBBJ), don't expect to be happy.  Remember, the profile is established by the first reviewer.

Of course, you can always PM several guys who have seen her and written reviews.

Sent my partner's ATF an email with different scenarios I would like to play out.  In her defense, I was graphic.   In my partner's defense, he was shocked at the things I wrote.  This was my first experience with a provider and a quick learning experience that provider does not mean up for anything.  So my only advice, "don't ask her to suck your partners cock while you fuck her in the ass with a dildo."

That will get you shut down.

...Or specifics I need to know in planning his date.

Once I am comfortable that the client is who he says he is and is approaching with the right intentions I'm perfectly comfortable with him speaking freely.

I do say "please no more sensitive language that you need for me to understand" or something to that effect because I'm very good at reading in between the lines so pushing it isn't necessary.

But it is perfectly okay for you to express your preferences and needs with many providers prior to meeting- just a) ask if its okay with her before seguing right into it and b) try not to come off like you're in need of 900# style cyber sex prior to meeting.  She may mistakenly dismiss you as a timewaster.

If what you want are specific sexual acts, then there's a pretty good chance she will change her mind about seeing you. I have occasionally beat-around-the-bush a little about dfk, or cbj vs bbbj, and usually got a response without losing out, but as has been stated elsewhere in this thread, I have a fair amount of experience - plus, honestly, I was prepared to lose out on the date if she did get annoyed.

On the other hand, I have had great success describing in detail the way I wanted her to dress, act on arrival, general likes and dislikes, etc. and in most cases, she appreciated very much the details that I told her so she would have a better idea of what I was looking for. Several providers have told me that most guys give no idea at all what kind of session they like and then complain afterwards when they don't get what they want. What sense does THAT make?

that doesn't include a sex act.  I might suggest via phone or email "street clothes" so I can undress her.  "Some soapy fun" so she has an idea I want to shower together & not be upset about makeup & she might want to tie her hair back so it doesn't get fully soaked.   But we have seen each other many times.  
Even with a Fav, I would wait until we are naked between the sheets before I whispered a suggestion for a next act.  

I find a lot of first reviews state BBBJ when the gal might not routinely offer that, according to her reviews.  This is one reason why VIP to read full reviews is important.

This is the most intimate of experiences for which we contract.  I have found that communication in advance is critical to a satisfying experience for both parties.  If she is not the right girl for you, she would rather let you know than disappoint you.

I have a major foot fetish and I enjoy Greek.  If I show up and she doesn't like having her feet touched and/or some gentle, respectful anal then I am disappointed and she has an average review on her hands.  And money and time are wasted.

I have NEVER, ever had a women tell me "TMI".  She would much rather know.  There is a reason I don't have any "bad" reviews that I have given, I know that we are a wonderful match before I get there.

I never mention any acronyms or anything graphic in my correspondence. Sometimes if I see her in a nice outfit on her website I may ask if she could wear something similar to that. Once, we are alone at the start of our date as we start to get to know each other I may make subtle mention of certain things like # cups, daty to help manage our mutual expectations.