I think the usual "standard recordholder" on dick size was "Big John" Holmes, a very well known pornstar, who died of aids some years back, but there was a TV programme here in the UK about a chap who was supposed to be the biggest in the UK and it wasn't (I am told, I didn't actually watch it) so much the length, but the width - if I remember aright, 6 inches across (not round, across).