When I hear Sin City, the two things that come to my mind are violence and "whores, whores whores!", so I never thought that I'd find any good male nudity in the pages of this book. Luckily Tranetrax proved me wrong, he sent in these scans from Sin City featuring male frontal nudity. I guess I shouldn't be surprised since Frank Miller gave us the naked Spartans of 300.
From Hell and Back:
From The Big Fat Kill: