The tough stuff you just have to ask yourself at some point.
  1. Would I be able to bite a penis clean off, if necessary?
    Then there's the flaccid vs chub vs raging debate - is one easier than the other in terms of achieving breakage in one fell swoop? If it's a full blown boner, there would probably be a lot of blood...and sperm if on brink of ejaculation. But flaccid...let's be honest, it would be like chewing through the most salty, rubbery, raisin-like, wrinkle-dick of your imagination. I don't want that shit. Honestly, if I'm going to castrate you, I want people to know by the blood running down my chin.