There was a Wolverine story that outed the Punisher. It was kind of a joke (and one stolen from the movie "Murder by Death") that the Punisher's interest in muscle-men magazines was down to his unceasing search for suspects. Wolverine, on the contrary, said the magazines explained a thing or two.

Then there's the Living Lightning who Slott (or Austen) outed. I tend to assume anything these guys put out is happening in an alternative reality anyway (the land that dialogue forgot). Lightning is the only Avenger on record to invite a girl back to his room and turn up at the breakfast table with her the next morning.