What if instead of getting rid of them quickly there was a way to slowly profit off them, and make them infertile, so they couldn't come back. You could harvest the organs of their unwanted children, and convince the boys that bobbies are so great, they should get their own, while reminding them they cock and balls aren't needed, so they should be removed. For the ones that don't fall for it, you could develop a poison but say it's for their safety, they'll be lined up to take it, and let the world know they are ready for an ass fucking.