We're not saying there's anything specifically wrong with James Franco - but we do now have two cases of well-known actors refusing to kiss him on movie sets. Again, though, we're being told that there was no personal issue between Sienna Miller and Franco that prevented the kissing scenes in 'Camille' from being shot - she was just having a really bad time with her teeth while the movie was being made.
The lack of intimacy between Miller and Franco definitely hurt the film - they were cast as newlyweds, and therefore they should have been much more romantic with each other - but according to Miller's account, the problem couldn't be helped. Her dental issues became so pronounced that an emergency dentist had to be called to set. We don't know precisely what the issue was - but it sounds like it might have been messy!