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Following a historical sketch of attempts to explain homosexuality, we review evidence indicating that the process of determining human sexual orientation is fundamentally the same in all mammals. In this process, four phenotypic dimensions of sexuality develop from two more or less distinct sex genotypes. Studies are reviewed that indicate how phenotypic deviations from these two genotypes (called sexual inversions) can occur. The causes of sexual inversions are categorized as genetic-hormonal, pharmacological, maternal stress, immunological, and social experiential. From this evidence, we propose a theory of how the entire spectrum of human sexual orientation (vs. simply homosexuality) is determined.A consistent preference for sexual relations with one's own sex (homosexuality), the opposite sex (heterosexuality), or vary-

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Although there is substantial evidence in the historical and anthropological record of the sexual use of children by adults, surprisingly little is known about the etiology of pedophilia or its relation to other forms of sexual aggression. After briefly reviewing the research on pedophilia, we argue that one major difficulty in conducting or interpreting such research lies in the different definitions "pedophilia" has received. Most important, much of the research has accepted a legal definition of pedophilia, treating all offenders convicted of "child molestation" as pedophiles, regardless of the age or appearance of the victim. We argue that a distinction should be made between biological children and sociolegal children. Laws governing child molestation reflect sociolegal childhood, regardless of its discrepancy with biological childhood. "True" pedophiles should be identified by their preference for biological children. By using legal classifications, researchers may well be confusing two distinct types of offenders, child molesters and rapists, and confounding attempts to understand pedophilia.

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