THE GREEN MARE (234 pp.)Marcel AyméHarper ($3).
THE WICKED VILLAGE (304 pp.)Gabriel ChevallierSimon & Schuster ($3.95).
A Kinsey litmus would probably show that the average Frenchman is no naughtier than most people, but French novelists have made his little delinquencies into one of the most readable of literary exports. To be sure, there are the existentialist writers who manage to turn sex into a measure of personal calamity and there are the Mauriacs who turn it into a measure of sin. But for the moment, U.S. read ers can settle back in relief with...