““The most difficult speculation for a science fiction writer to undertake is to imagine correctly the *secondary* implications of a new factor. Many people correctly anticipated the coming of the horseless carriage, some were bold enough to predict that everyone would use them and the horse would disappear. But I know of no writer, fiction or non-fiction, who saw ahead of time the vast change in the courting and mating habits of Americans which would result primarily from the automobile." Expanded Universe””
