To perform the back end cold front properly and succesfully, to start you will need to have a drink next to you when you plan on having
anal sex. Don't give any warning as to what you are going to do. The surprise is
key. After a few minutes and the sphincter muscle is loose get a good size ice
cube in your hand and when the moment is right slip it in the anus very quickly and keep penetrating the anus pushing the ice cube in farther.