Law for the Protection of German Blood and German Honor
Section 2
Sexual relations outside marriage between Jews and citizens of German or related blood are forbidden.
"Nazis didn't make a practice of raping Jewish women. Physical relations between an 'Aryan' and a Jew were criminal offenses. While isolated incidents likely occurred, any 'reports' would at best be anecdotal."
It might not have been official practice, but it certainly did happen in the ghettos as well as the camps. We can't keep prison guards from having relations with female prisoners today when it is a punishable offense. Sixty years ago in those circumstances there was no one to answer to for it.