I think a lot of the HD/LD situation is well...situationally based. An LD women is HD for some things when certain key factors are met. An HD women is also LD when certain situations occur. That means that LD women can be HD in the right circumstances unless there is a medical or mental illness present. I'm not saying that they'll stay in that state, just that reaching it is possible. The problem , oft times, is that they don't WANT to work on it.
That really leaves an HD man with only two options. Accept the LD on their own terms and be satisfied with what can be achieved or push for a new relationship.
Sexual counselors can help get to the bottom of a woman's LD:ness. They can also help HD men to understand the problems on their own terms.
If you're going to wait until your kids are older you might as well invest the time in some intimate counseling for you and your mate. Don't take no for an answer if this is so important to you that you will leave the relationship. If you do, then you're really not that committed yourself. Once you've exhausted all angles then you'll be able to shut the door on the current, poor, relationship with no problems or guilt. Take the time to locate a sexual counselling service in your area and drag her there if you have to. Them's my advice, and I's stickin' tuit.