On a few occasions I've had two orgasms back-to-back with continuous stimulation. I've never had more than two in quick succession, although I've had up to seven with short rest periods in between (I identify with the poster who talked about being extremely sensitive after coming; I'm the same way, so it's hard for me to take being stimulated right after I've come.) My Master does it anyway, though, just to make me submit (we're into BDSM), but most of the time this continued stimulation doesn't produce another orgasm, just shrieks and howls from me trying to cope with the sensory overload. Every once in a while, though, it does make me come again.