Cite as: 539 U. S. 558 (2003)
Opinion of the Court
homosexual conduct. It does tend to show that this particular form of conduct was not thought of as a separate category from like conduct between heterosexual persons.
Laws prohibiting sodomy do not seem to have been enforced against consenting adults acting in private. A substantial number of sodomy prosecutions and convictions for which there are surviving records were for predatory acts against those who could not or did not consent, as in the case of a minor or the victim of an assault. As to these, one purpose for the prohibitions was to ensure there would be no lack of coverage if a predator committed a sexual assault that did not constitute rape as defined by the criminal law. Thus the model sodomy indictments presented in a 19th-century treatise, see 2 Chitty, supra, at 49, addressed the predatory acts of an adult man against a minor girl or minor boy. Instead of targeting relations between consenting adults in private, 19th-century sodomy prosecutions typically involved relations between men and minor girls or minor boys, relations between adults involving force, relations between adults implicating disparity in status, or relations between men and animals.
To the extent that there were any prosecutions for the acts in question, 19th-century evidence rules imposed a burden that would make a conviction more difficult to obtain even taking into account the problems always inherent in prosecuting consensual acts committed in private. Under then-prevailing standards, a man could not be convicted of sodomy based upon testimony of a consenting partner, because the partner was considered an accomplice. A part-ner's testimony, however, was admissible if he or she had not consented to the act or was a minor, and therefore incapable of consent. See, e. g., F. Wharton, Criminal Law 443 (2d ed. 1852); 1 F. Wharton, Criminal Law 512 (8th ed. 1880). The rule may explain in part the infrequency of these prosecutions. In all events that infrequency makes it difficult to say that society approved of a rigorous and systematic
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