The wrestling angle is probably one reason (but hardly the only one) that "The Showdown Between Luthor and Superman," SUPERMAN 164 (October ’63) is my favourite single-issue Superman story. Here you have two sweaty men, bare-chested, bare-fisted brawling on an alien planet under a red sun. And they looked like real men--this could have been my Dad (black hair, curl over the forehead) and our next door neighbour (bald) on a summer day, with their shirts off, drinking a beer after having put up a fence. Except my Dad and our neighbour never came to blows and our neighbour was hirsute (no hair on his head, but plenty everywhere else).