Giving a reader a sex scene that is only half right is like giving her half a kitten. It is not half as cute as a whole kitten; it is a bloody, godawful mess. A half-good sex scene is not half as hot; it actually moves into the negative numbers, draining any heat from the surrounding material.

How Not to Write a Novel: 200 Classic Mistakes and How to Avoid Them—A Misstep-by-Misstep Guide