Thanks for everyone's responses above. I'm sorry if this is somewhat personal for the board, but I wanted to see if there were others who had a similar experience (from either side) and it sounds like there are. Plus, to be a DT fan you have to have a few working brain cells, so you guys are a good resource.
She went on the pill when she was younger, and had been on it for about 14yrs (we are 33yrs old) until last year. Even though the first 3yrs were good while she was taking it, we thought that could be a problem so we cut out horomonal birth control about a year ago. Nothing improved. From what i've read, HBC can permanently alter a woman's chemistry, even if she stops taking it.
She's not on any other meds.
I have considered that she may not be attracted to me anymore, and have asked her in the past if that is the case. She swears it isn't. We are very affectionate, very loving. Every other aspect of the relationship is great - we are that couple who makes people sick in the grocery store with PDA's. It seems that she is just very happy without the physical aspect and has no need for it anymore. I think she spoke to her doctor at one point, but i'm not sure there is much they can do about it.
As i said before, because i don't want to make her uncomfortable, i basically stopped bringing it up. The LAST thing i would want to do is make her feel like she has to oblige me.
Some thoughts - I am wondering if it is just natural for a woman to stop wanting sex. Perhaps women are attracted to the untamed side of men, and when they get one home and domesticate him, maybe they just aren't sexually attracted to them anymore. Maybe it's natural for a woman to lose interest? I've heard that this problem occurs in quite a few relationships, and about 80% of the time it's the woman's libido that vanishes.
Thanks again for your ears and suggestions