How to judge her excitement

Every guy wants to know how to judge the effectiveness of your performance. Well let me tell you that there are two types of girls that i can tell. Squirters and creamers. Now i have squirted before a few times but ultimately im a creamer. If i get turned on im def more likely to cream instead of squirt. But each girl tends to be different. I am sure that some will argue that neither is an effective tool to measure excitement but i think that one of the two are the most probable ways of determining a girls excitement.