I thought you were talking about poliamor.
Yeah, Jean is th eonly that isn't allowed to have other pairings.
this leads me to another conclusion, when talking about age of x-men jean, JDW said that they changed bishop/ororo to bishop/jean because Jean never had anyone else. He already knew what would happen on hickman x-men, if she was having sex with Logan that change wouldn't happen on AOX.