What would a blog about shirtless superheroes be without Wolverine? That's like having an Archie comic without Archie. These scans of everybody's favorite furball were sent by the lovely sarafimm (thanks!)
From the cover of Weapon X #16
From Barry Windsor's Weapon X comic. Naked Wolvie bondage!
From Ultimate Spider-Man #66
From Ultimate X-Men #53
From New X-Men 148 (two people sent me this image, Kevin K. & sarafimm)