Newbie - FAQ
When I decided to become an escort (not so long ago), I had an idea of what I was happy and willing to do with men I have just met. In my personal life, I love to kiss, love giving and receiving oral sex, love switching up positions multiple times and overall being affectionate and romantic. The thought of doing all those things more than I had a chance to do it in real life as a single girl AND getting paid for it was exciting to say the least... So that is what I did in my first few sessions and both me and the gentlemen I met had a great time. I was talking to one of them and he mentioned what a great "GFE" I provided. I had no idea what he was talking about. 
So I started to research the different acronyms and "methods" used in the hobby community and that just confirmed that I would not be able to provide anything different from GFE. To me, if there is no kissing (DFK, making out, etc), there is no romantic mood. If there is no oral sex (preferable both ways, lol), it's not much fun... It just seems too mechanic to me. I can't just do the straight sex, hands off method. On the other hand, PSE is beyond my comfort level and with 1 in 4 people having an STI, I just can't get myself to do it...
There might be ladies who go through the same "evolution" you've gone through as they get more into the idea of this profession being fun, but I can see it going the opposite way too: someone who offered PSE has a scare, realizes that it's too much of a gamble, decides to go back to GFE, or someone who grows tired of getting so intimate with strangers and decides it's only certain sex acts and makes it strictly a business transaction.
Ultimately we can all do whatever we feel comfortable with because luckily there are takers for all of those things on both sides.
Granted the newbie board is supposedly a "kinder, gentler" place to ask questions. But your inference on BBFS is NOT a logical issue EVER! And don't even think of posting something like this on the GD...you won't like the retort in the least!
I am well aware that some hobbyists will seek this, and some gals will provide this. But if you give a damn about your health (or she hers!), you need to clearly and completely understand that if she is going BBFS with you...she is doing so with others! And if you honestly think a "recent" test along with a "promise" is something that will give you a comfort level, then you are one hobbyist that I want to stay VERY VERY far away from (and any and ALL gals that you are seeing, or have seen!) 
Wake up right now and learn what is relatively safe (at least for your comfort level), or be prepared to pay the bill later (and it could be a very expensive one at that).
And PSE is in NO WAY BBFS!
as thinking that BBFS is part of a PSE (in some form) and that you might have an interest in it.
If indeed we are clear on the BBFS NOT being an OK activity...then I humbly apologize.
And we can both know that in some cases that activity is out there (on both sides). I have WAY too much to lose if somehow I ended up seeing a gal that likes to participate in that activity. But generally it is not openly discussed, which can make it a slippery slope to actually believe that my "date" is OK from that perspective. However, she may very well be going BBFS with her SO or BF...and that I do understand. It is where that gal is openly advertising (and that does occur) this activity, and the guys who actively seek that out. I want to make sure I steer as far away from those folks that need that activity, as I know it will not be a good situation for me down the road!
As far as why a gal would do that activity...not a difficult formula to understand. It is all about the Benjamins (and she will charge extra for this wonderful priveledge). Fortunately, I have tried to make sure that the ladies I have seen (or will see) care enough about themselves (not drug addicted, money challenged, et al) to stay away (from those clients) that seek such a high risk activity.