I'd like to add my two cents worth...
I was at the point with my girl where I was thinking about confiding in my best (guy) friend that she was kind of boring in bed. I was upset because I love her dearly but the sex was a little dissappointing. It was she who suggested a little bondage one evening and it has only become better and better since. Whips, chains etc... I can't wait every week to see how much further I can take her.
Bring it up...you'll probably be surprised at the results
Good luck