If you answered…
Ass – I want you to sit cross-legged on a carpeted floor and drag your ass around the room without using your hands. That should give you a rather painful friction burn!
Balls – Find a jug, fill it up almost to the top with freezing cold water and then dip your balls into it! Keep them in there for one whole minute.
Asshole – I order you to lube up that dildo again and put it up your ass. It is to stay there until I say otherwise.
Feet – Feet? What kind of weirdo are you? I suspect you’re just trying to take the easy way out. For that, you have to do ALL of the 3 things listed above. The order in which you do them is up to you.