(Novelists, when their characters drive cars, never feel compelled to describe precisely what the physical actions are of the hands, feet, eyes, knees, elbows. Yet many of these same novelists, when their characters copulate, get into such detailed physical description you'd think they were writing an exercise book. We all know the interrelation between the right ankle and the accelerator when driving a car, and we needn't be told. In sex, we all know about knees, thighs, fingers, the softness at the side of the throat, here-let-me-help, how's-that, mf, mf, mf, mf. And if you don't know it, you shouldn't read dirty books, anyway; they'll only give you the wrong idea.)
--excerpt from Dancing Aztecs by Donald Westlake
My mom was a big fan of Reader's Digest Condensed Books and, therefore, I read a lot of these as a kid. You know what they condensed right out of those books? You guessed it--all the sex. Years later I read the UN-condensed version of a Ken Follet novel and WOW was I surprised.
I had to share this best fade-to-black scene I've ever read.