The world of Comics (DC and/or Marvel, etc)

Superheroes.

Supervillains.

Both sides of the battles of superhumans have their relationships. Marriages, relationships, and more. Now witness as the women of those worlds, heroine and villains as well as others, have their men cheat on them for the purpose of their own pleasure.

This is also the place for any other media which originates from comics. Like films, movies, video games, and so on based on media which started in comics as well.

So if you want to see Superman cheat on Lois, Spider-man to cheat on Mary Jane, or anything else like that... this is the place to start. As long as the lady in question is aroused by the act of their lover straying, this is the place for all of that to begin. Starting with...