I've only had sex with one girl ever and I could get her off almost everytime, whether it be oral or just straight up sex, multiples are great too. I could definatly feel the difference and she would sometimes tell me whether or not she had one or not. Honesty is really the most important thing, cause if she told me she didnt get one
I'd finish her off
I honestly would feel bad if she didn't have an orgasm, it's true