None of my 3 kids has ever used a pacifier. I tried with my first two, but my eldest would spit it out immediately, and my middle child acted like I had mortallly wounded her when the rubber touched her lips! I never bothered trying with my youngest.
I have been a human pacifier for all 3 kids, and am still one for Ever, who turned 2 last month. I am cool with that, since it keeps her happy, and my boobs don't ever get lost, or fall on the ground! ;-)