Recently McMaster University performed a study. It was to study the results of a woman during her "peak". During the study it was revealed that there were four different peaks during an aroused state. They are paraphrased in no particular order below:
One was the positive peak, and can be distinguished by words such as "Oh Yes, Oh Yes I'm about to..."
The second was the negative peak, and can be distinguished by words such as, "Oh No, Oh No, I'm going to...."
The third was the religious peak. This can be identified by such words as "Oh God, Oh God, I''m about to....
Although never personally experienced, the third peak was the fake peak. This can be distinguished by words such as "Oh Dan, Oh Dan, I'm about to..."