I have indeed but vocalization is not what one should pay most attention to. When a woman has an orgasm, she will have a series of involuntary contracts in her vagina. If one is paying attention, they are unmistakeable and can't be faked. The only reason that a woman will not orgasm is in those rare cases that she is suffering from anorgasmia, is way too tired or stressed in which case she shouldn't be pushed into having sex or if the man is crap at what he's doing. Any man that spends the time, effort and attention will be able to make just about any woman cum. It really comes down to him and what he does.