women (and men) vocalize how they vocalize, and the variety of peoples' actions is what makes possible for the variety of peoples' tastes to be satisfied.
As for the fixation of many of my fellow men upon whether or not a woman is having an orgasm or not, or if she is faking one, I don't think we should really care. All we can do is be the best lover we can be and contribute to as much mutual satisfaction as we are able, and if a woman feels inclined to fake it, so be it; that's on her. she is likely to be faking only to either satisfy you or perhaps to try to get you off quicker and shorten the experience. if there's any other reason a woman might do so, i don't claim to be an authority on the issue and i'd be glad to hear it.
If she's doing it to pleasure you, maybe she enjoys sex but doesn't have orgasms frequently or at all. Perhaps in acknowledgement of how common the fixation of getting a woman off is among men is, maybe she opts to fake it, to not make problems with a man's ego if he is one of those suffering from this fixation. If this is the case, all you can do is try to contribute to as much mutual satisfaction as possible and enjoy yourself. Or perhaps she feels that she is not normal (whatever that means) and fakes it so you don't think there's something wrong with her. If this is the case, all you can do is try to contribute to as much mutual satisfaction as possible and enjoy yourself.
If you think she's doing it to possibly shorten the experience, then she's wouldn't be at the point of simply asking you to stop having sex mid-intercourse, at which piont you're confronted with either gambling and saying "hey, i think you're faking it, do you want to just stop?" or trying to finish as quickly as you're able and ending it that way. if you confront her, and you're wrong, the price is probably high in awkwardness, and just blowing your load and calling it a night isn't so bad, imho, so again, i reckon the best option is to try and contribute to as much mutual satisfaction as possible given the circumstances and enjoy yourself.
just my thoughts.