The writer may justify the effort of rewriting this scene many times. When a writer finds himself as much physically affected by the tenth draft as he was by the first, he knows he is on to something. The writer must be as nude in his own way as the photographic model two pages back in the magazine. The writer must show his literary equipment. The reader cannot be expected to get off while the writer holds back like a five-dollar hustler.
Effectiveness is the criterion for the erotic scene.
The rules given here are guides to effectiveness, but if the scene is effective, the rules are off. Make the reader want it. Make the reader wait. All of it.