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Zilbergeld, B. (1978). Male sexuality. Boston: Little, Brown. NOTE: In sum, the presented data should be interpreted with some caution. Certainly, some of the methodological pitfalls or problems mentioned are general to this kind of research, and it may also be clear that any solution or approach has its pros and cons. Still, while this study has its own drawbacks, we believe that the presented data delineate a realistic range of penile circumferences, with values closely resembling values previously reported in other countries.