It is true that women can have unlimited orgasms and different kinds. We are so lucky in that regard. The question of how many has been posed to me often. Honestly, I am not counting and evaluating what I am feeling, but simply enjoying the pleasure that surrenders me into that luscious blissful moment. My personal advice to all men is to focus less about the numbers and focus more about the how. For example, being teased is more powerful to me than having many O's or having my nipples sucked on for a generous period. Another woman will tell you something different.
Regarding becoming sensitive, yes that happens to me too with clitoral orgasms.