Hi Meatpuppet Sorry to hear your talk did not have the desired effect. I can understand how frustrated you must be feeling. I guess its not so much the lack of sex as the thought that your feelings do not seem to matter to your W.
I feel pretty certain your M is not going to last if you go on like this. It's because this clearly is a big problem for you and you are very upset about it but your W is not doing anything to help. You are in danger of becoming the classic walk away spouse. But hey, you are in the right place! (like having a heart attack in the doctor's waiting room)
So I think the thing for you to do is read DB/DR (if you havent already) and start putting it into practise. Don't be afraid to go for something drastic either. Its a pretty serious sitch.
I would say your W is one who clearly doesn't respond well to talking so forget that for now. I think that's what they call "a cheeseless tunnel".
I keep advising people to do DBing when I still haven't read the book. But going by the threads I have read it really does work, and anyway I haven't heard of any other options. Lets face it most people who feel like you do would end up getting a D. But perhaps you can turn this around and it's certainly worth a shot.