Cena's standards must be pretty low. His wife wasn't all that, he joked in an interview on Youtube about how he banged some fat chicks before and now this. I wouldn't put my dick anywhere near a porn star. And like most porn stars, she's not even that hot.
Also, on what grounds do the WWE have to sue Cena's ex-wife? If she wants to reveal this and come out in public with it, there's nothing they can really do about it.