A five-item Guttman scale of social heterosexuality was developed in a sample of 1,029 ten-, eleven-, and twelve-year-olds in Pennsylvania. Since the theory of a sequence of developmental stages makes the same requirements of items as does a Guttman scale, it was suggested that these items represented a series of steps in the development of normal heterosexuality at these ages. The study was replicated with a sample of 610 children of the same age in Missouri, and the results supported the same conclusion.
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Broderick et al. (1968) studied this question.
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