Don't talk top the LD like it's only their problem. Act like you want to team on this project. The goal is a better marriage, which means more of you getting your needs met as well as hers.
However, if her line is alway "I'm not going to change", then somewhere down the road yo will have to decide if you can spend the rest of your life with someone who is not interested in making your marriage as great as it possibly can be. It's not so much about the sex then, it really is her whole attitude about being married to you.
