 Among the films rated for having the most romantic kisses are "Gone with the Wind", "From Here to Eternity", "Casablanca", and "To Have and Have Not".Sociologist Eva Illouz notes that surveys taken in 1935 showed that "love was the most important theme represented in movies.Similar surveys during the 1930s found the 95% of films had romance as one of their plot lines, what film critics called "the romantic formula."