Keep reading here and the sex forum. You'll see that there are both men and women in the same boat as you are. Some have had success turning this around and the rest of us just keep muddling through.
Myself, I've been married 27 years, 3 kids. My biggest complaint is frequency. As of now, we have had sex once in the last month. Other times it's more frequent but the average never really goes past once every week or so.
We did the counseling route, read the books and talked til the cows came home and things got better.....for a while
IU know I can get flamed for this but other than that she's a great person and great mom. She does take care of me but I now equate it to the way a mother would take care of a child (except for the occasional sex!
How do you cope? Personally, it does get easier with time. Develop outside interests. Rekindle old friendships. deveolp or re-start hobbies. Do what YOU want to do.