How come some girls don't like to be eaten out?

If there are so many nerve endings down there.... why would they not like to be eaten out?

One time a girl told me that she didn't like her boyfriend to eat her out so that he didn't have "that power over her."

How could it not feel good? I have never met a guy that didn't like to receive oral.
How come some girls don't like to be eaten out?
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