Yes! I dont know if this is common knowledge but I found a source for the quote about 137 out of 139 German "war criminals" having their testicles crushed beyond repair during interrogation this allegedly comes from Judge Edward L. Van Roden, a part of the "Simpson Commission” to investigate the alleged misconduct at Nuremberg

Other methods used by the American interrogators included brutal beatings, placing a hood over the prisoner and punching them in the face with brass knuckles, breaking jaws, knocking out teeth, starvation rations, and solitary confinement. The prisoners were then presented with prepared statements to sign, “confessing” to various crimes

Probably an even better citation is this 2012 daily mail article about the torture of Germans in Britains "London Cage".. there was a memoir by the head of the london cage Alexander scotland which ended up being heavily censored before being published which allegedly detailed the claims of brutality, use of torture and psychological abuse used against the Germans.. the author of this book claims to fill in the gaps but I have yet to read it..amazingly this guardian article also touches on torture in the london cage