In spite of the well recognized fact that human mating has been going on now a million or more years it might seem that these same humans might make a better job of it, or to adopt the psychoanalytic formulations, their Ego and Super-Ego should work in better harmony in the management of their Id, and that books of this general nature should not be needed.

But the facts, like Johnson's rock, remain indubitable and no amount of autistic thinking will remove them. Human matings are rarely much over 50 per cent satisfactory, i.e., to the individuals concerned. The race goes on apace and rarely looks back over the pathways taken. Hence the need and in this case the usefulness of these small guide books to human happiness and felicity.