Hrm.
This is odd.
When my girlfriend orgasms, I have to guess when she's went usually haha(it's fairly obvious), but she doesn't tell me, and lets me continue to "fiddle around" down there. And even when I know that she has gone to orgasm, she's usually immediately ready for round 2 anyway! Weird how she doesn't get this described affect... or maybe she does, but just likes it!
And no... she's not faking her orgasms, for anybody who might suggest that.