One of the reasons I rarely watch movies/tv shows made from books I like is that my idea of what the characters look like is radically different from what Hollywood makes of them.

I prefer to write my characters with broad strokes and let the reader do the hard work. This is especially true in my erotic writings, as I want the readers to be able to identify with the characters. I wouldn't want to lose a reader because their bodies (or the bodies they fantasize about) don't fit the measurements I've described.