Which is also why I never rely on the very vague and subject to wide-ranging interpretations acronyms of "PSE" or "GFE." If there is a specific act that you want to make sure will be part of the experience, I've found it's best to confirm that ahead of time. Of course, asking such questions can create tension with the girls unless you have a very good referral, a bunch of reviews or are whitelisted here.
As far as your more general question, it has been my experience that porn chix are usually ok with bbbj (almost all that I have seen and I'm up to 40 or so at last count) as well as cim. Personally, I absolutely see this as being an integral part of "PSE" since 95% of the scenes I see seem to end that way! Of course, it's point of personal preference for the girls and I respect anyone's decision to set boundaries with which they are comfortable. Just as I respect my ability to have this issue be a deal breaker, I personally do not see girls who do not allow bbbj/cim, in or out of the film arena.
That said, I just conducted a very unscientific poll for you, doing two review searches here, setting the following parameters: 1) Porns Stars in US who allow CBJ and 2) Pornstars in the US who allow CIM, either spit or swallow. In the first search, there were 21 pages of reviews and looking thru the 1st 5 pages, only saw 5 names I recognized: Courtney Cumms, Sophie Dee, Kelly Devine, Anita Blue and Maya Hills. Interestingly enough, for me anyway, the only one of those I'd be interested in seeing anyway would be Anita. Also made me reflect that I've met Sophie Dee on at least three separate occasions at industry functions and she was a screaming bitch every time. Never did figure that out, I'm actually quite gracious as such things.
Anyhoo, search 2 had 37 pages of reviews, with a lot more names I recognized in the 1st 5, Jessi Castro, Becca Blossoms, Dani Woodward, Keisha, Flower Tucci, Karen Fisher, Ashley Shye, Shay Fox, Dahlia DeNyle, Valerie Castro, Ginger Lea and Sara Jay (and have had the pleasure of spending some quality time with Ashley, Valeria and Dahlia). You can add to that list Nikita Denise, Claire Dames, Kiki Daire, Mia Domore, Sasha Knox, Taylor Lynn and Veronica Jett as girls who agree with my analysis. It would seem there are lot more girls who do than don't allow bbbj!
Still, the real points here: assume nothing, get and use you TER VIP membership! Look thru the reviews carefully, it's been my experience that if more than a couple of the reviews provide specific details regarding what you're looking for, you're quite likely to have that be part of your experience, understanding, of course, that people do change their minds about things so you still may want to verify with the individual provider!