For me personally, 5 was the record on my own (that was using the technique where you stop all contact just when you cum, which makes it less sensitive straight afterward - but this typically makes the orgasms weaker so I don't do it any more).
When with a girl, the most I had was 3 (not using the technique described above - she was just damn hot!).
On the reverse, a girl I used to date once came somewhere between 15 and 20 times. I lost count after about 10. She was amazing and I really miss sleeping with her. It's funny, the most amazing sex can't make up for an otherwise shit relationship.