In the case of pedos, (male obviously), I would make them stand with their dick and balls laying on a stump while they are restrained. Then in front of their eyes, sledgehammer their nutsack Gallagher style.

Then inject a syringe full of alcohol into his scrotum and exploded balls. Once it is nice and full of alcohol, give him a good crotch kick to move the alcohol a bit inside of his body. Might sting.

I guess after that, you could tie one of their legs to a vehicle and slowly drag them while dogs chased them. They'll nip at the bloody ballsack.