I have a fuckbuddy who's incredibly orgasmic. Always 4 or 5, maximum somewhere around 20, and they're very powerful. She says they are triggered by 7 or 8 different points inside the vagina. Any one area can only have one orgasm and then requires a fair amount of time to recover, but given the different areas, I can stimulate 8 orgasms in her within 30 minutes.

Having a partner who's able to do that makes sex a much different experience than only one or two per session.