"The answer to "I can make any woman squirt" is "You don't really know much about women, do you?""
From my experience, that is true. From what I have seen , most women do not squirt or have to put forth a lot of effort to squirt. On the other hand, for those who can , the quality of the partner enhances the experience. I've had lovers who told me they rarely squirt as they soaked the bed and my mid section and had nonstop orgasms.
They haven't been frequent but I look at them as happy mutual surprises.