Todd McKie explains to his wife the difference between real life and the things he writes about, in this humorous piece on McSweeney's:
I keep telling you it’s only fiction, this thing I do late at night. This thing I do while you’re snug in our wide bed. If I put a woman character in a story and I make her a potter and she has black hair and her name is Patricia, well, of course it can’t be you, because you’re a painter and your name is Priscilla, and you have brown hair.
Don’t you get it? I make it all up!
Entertaining and true: http://www.mcsweeneys.net/articles/explaining-literature-to-my-wife