They sound more "dramatic" than the British and American girls I've heard or been with. Plus, instead of a build up to a climax or excitement it seems more of a rolling thing.
It's almost like there is no real "orgasm" because it sounds like they treat the entire process as the climax. There never seems to be a point where they get louder or more enthusiastic. Instead there seems to be a level of noise and moaning that is constant from start to finish.
So, so, odd.