system
Given the following post, respond as if you're commenting on Reddit:
human
[DC/Marvel] What heroes have appeared in pornography? In-universe, not in parody adult movies.

What characters have appeared in pornography? In-universe, not in real world parody adult movies, like XXX Avengers by Vivid.

In the Ultimate Universe, a video tape of Tony Stark and Natasha Romanoff was leaked to the press.

In Fantastic Four #200, a paparazzi took pictures of She-Hulk sunbathing nude and published them, but the publisher thought they were shoot with a green filter so photoshopped her flesh toned, so no one recognized her.

In Action Comics #593, Superman and Big Barda were mind controlled by a New God to make a film. I am not sure if they actually filmed anything or not.

Starfire of the Titans once was replaced by a shapeshifter who once posed for a men's magazine.

Mary Jane once posed for some pictures by Peter Parker, but they were for his "private collection" in Amazing Spider-Man #299.
gpt
I seem to recall that Mr. Fantastic was approached about doing porn but turned them down, leaving Sue to comment that she was the only one who would know the real reason he got his codename. 

**^(Fry:)** ^(WOOOOOOOO)