We seem to have a peculiar urge to believe that the way we have sex, the thing that got us all here, is unprecedented. It’s like the familiar difficulty people have imagining that their parents had sex. The reason sex can be revolutionized again and again is that we’re reluctant to believe our ancestors could have known and felt what we know and feel. Yet what has been will be again; what has been done will be done again; there is nothing new under the covers.

Ariel Levy, “Novelty Acts”