It's hard to say what's the largest I've taken. For me it really narrows down to the guy's skill. I've been surprised by some of the sizes I took when young and also "hurt" by relatively small men. Almost always, the huge guy knows exactly what he's doing and has the skill to make it work. Of course one must be up for the challenge too! The small guys almost always, really don't know how to give it, lack skills and just ram it in and plunge away. I've also noticed I have often chocked on the small cocks far more that really large ones too.