Originally Posted by Sultana

*Please* do make an appointment with a counselor. It will communicate to her the seriousness of the issue. I'm sure this is fixable, you've just exhausted your own store of resources, time to try something different.

I've read somewhere here on TFP (I wish I could credit the author, sorry!)
"When the sex is good, it's 15% of the relationship. When it's bad, it's 80% of the relationship."

Or something to that effect. Strikes me as very accurate.