ALEXANDRIA, Va. -- An ex-diplomat convicted of having sex with teenage girls in the Congo and Brazil and taping the encounters is asking a judge for leniency, claiming that cultural differences in those countries make sex with girls more acceptable.

Gons G. Nachman, 42, pleaded guilty in April to possessing child pornography after admitting that he had sex with 14- to 17-year-old girls while serving as a consular officer in Brazil and Congo and documenting the encounters in pictures and videos.

The judge has agreed to delay Nachman's sentencing until Aug. 22 so that he can be examined by noted forensic psychologist Stanton Samenow. Defense attorney Stephen Stine said in court papers that a psychological examination might show that cultural differences led Nachman to believe that sexual contact with teenage girls was acceptable, and that should have an impact on what kind of sentence he receives.

Prosecutors rejected the notion that Nachman's victims somehow deserve less protection because they were not born or raised in America.