I'm not saying she cheated she may have taken a pick of a guys junk while on girl's night out or some crap but her story is totaly bogus and since she isn't telling you the truth on that (and god I hope you know she isn't) then there is no reason for you to believe that it was innocent.
Sometimes girls like that want a guy that'll take charge and not the one that bends over backwards.
Still saying you should tell her anal will trully show you that she loves you..... Then afterwards tell her that it was gross and you can never look at her the same way :lol: