You are complaining of sex being boring. Have you read Passionate Marriage by David Schnarch? We’ve discussed it quite a bit on this board. It might be helpful for your sitch. There is a lot more going on in your marriage than just a lack of sex.
Schnarch discusses a concept called the “Tyranny of the Least Common Denominator.” I mention this on Mojo’s thread here and on Lou’s thread here. The boredom in your marriage may be as much your doing as your wife’s. It sounds like she may have some major hang ups, but I am also hearing issues with you. If she says she feels you are controlling her, then from the standpoint of improving relations, you are. But you might be put in this situation because she refuses to make the necessary choices and growth needed to move forward. I mention this to Hairdog here.