Many punters think that making a WG cum is extremely difficult and that most times the WG just fakes an orgasm quite convincingly. Well, in my opinion, the answer goes as follows.
Any woman –including WGs– is capable of having an orgasm. But there are various types of orgasms. An orgasm by clitoral stimulation is the orgasm that ALL women are capable of having EVERY time. Basically if you rub or lick her clit with the right technique for some time (nb the duration varies from girl to girl) she will eventually cum. You know if she has reached an orgasm or not by the fact that when she cums by clitoral stimulation her clit becomes too sensitive and she will immediately stop you from further stimulating it by pushing your head or hand away. Achieving orgasm via penetration sex is more difficult and not all girls are capable of having one every time. That said, large penis size, great stamina and good sex positions are significant factors and play their role. In any case in order to increase the probability of an orgasm via penetration, a clitoral orgasm is important to be preceded. This also increases the probability of multiple orgasms. Squirting is the extreme and can be achieved by G-spot fingering after giving to the girl a special kind of massage. In squirting the caveat is that the girl might think that she wants to pee and intercept the intercourse (thereby ruining all the work you did). You have to work around this by building trust.
Now what about WGs? Why are they often different? Why do they rarely experience real penetration orgasms with their clients? Is it because their vaginas become so loose that they can only be satisfied by huge 11+ inches penises? Well this might be a stupid way to explain it. The true answer is usually simply the fact that many WGs don't want to (really) cum with their clients. If for example they know that fingering may cause them to cum (or accelerate it) they are not allowing you to finger them. Or if licking their nipples (an erogenous zone) will accelerate them to cum they will also prevent you from doing so. They may also prevent themselves having an orgasm by very simply not relaxing their thoughts and refusing to get mentally into the session. Usually these girls are those who see many and successive clients without a break in between sessions.
In my experience whenever the WG does not pose such restrictions and allow themselves to cum I have almost always been able to make them having a real clitoral orgasm. For penetration orgasms it is really hard to tell. There are various indications that help spotting fake from real orgasms but WGs know them and may fake them as well. In all of my punts the WGs had an orgasm or most probably an “orgasm”. You have to be more than naïve to believe that these penetration orgasms were all real. That said I can proudly say that I was able to make a few escorts squirt. And squirting cannot be faked since ejaculation occurs (followed by body shaking).
I have also observed that in outcalls –especially relatively long ones during evening/night- the girls are more open to allow themselves cumming. There are some escorts around who are in the escort business just because they want to combine having (hopefully good) sex and earning (a lot of) money. So generally I wouldn't be surprised hearing that a mature Bulgarian escort came. But I am not sure what you mean “she did AND IT WAS MENTAL”. Considering the fact you don't mention about previously giving her any dedicated clitoral orgasm it was perhaps just a loud fake moan. Perhaps it was indeed real (as you mention about heavy breathing) but given the fact she is a mature escort she will also be a very talented/experienced actress.