Edited sentence: Largely due to the age gap between the two.While this is normally not a problem for the hundred year old plus Wolverine in the comics, Jean was technically a legal minor for at least part of the first season of the show (she was around 16 to 17 at that time on the show), and the writers likely did not want to portray such a relationship to avoid censorship issues, a problem which does not exist in the comics as both are over the age of majority and of consent