Male is handcuffed and having a weight attached to his balls: whipped by girl in the sound-proof chamber
Goddess comes to the stables where ponyboy is kept: his balls to be tormented with rope bondage and then locked into chastity cage
The worst femdom tortures you can imagine: hitting weak penis with mouse trap and then cutting off balls with castrating device
Cruel woman gives slave a painful punishment by whipping his ass and putting a couple of lashes across his balls