And what if all of that fails?
This is where it gets interesting, I think.
If the communication fails, then perhaps that is the root to the marital problems, not the sex. In an open communication, ideally,
something is worked out. Even if it is just more communication over time or turning to counseling for help.
If the communication fails, then something needs to be fixed there before sex even becomes an issue.
And believe me, I know the subject of sex can be volatile; I've had similar issues before. But it's solved through active communication--concession and compromise. Otherwise, the marriage is just going to go to hell. Even if the sexual issues are solved, other issues will come up and without communication, a vicious cycle will evolve that will make for an unhappy relationship.