I'm interested in how old your kids are. After my last two kids I had a very reduced sex drive compared to what it had been like during pregnancy and after I had my first two kids. I did talk to my doctor about it as I was thinking it was probably my birth control. He said that was unlikely, but I'm still not sure. Anyway, obviously you are not on birth control, so that isn't your problem. My doctor and I did discuss how sometimes the internal worry of getting pregnant can cause some women to have a lower sex drive and they see sometimes an increased sex drive in women after a man has a vasectomy. :) Of course you are probably not ready for that (we aren't either).
I agree with the posters who said that sex starts in your mind. You have to make a conscious effort to be in the mood sometimes, and it isn't easy. But it does help if your husband knows some things that will help you get there, the connections throughout the day, the non-sexual hug, the spending time together.
Also, I have seen improvement when I am exercising regularly. Unfortunately, right now I am having trouble fitting that into my day, but if you can schedule that in, I think it really does help. Part of it is that it makes you feel better about yourself and the way you look and this does then translate into you feeling more sexy. Also, go out and buy some new lingerie, something really pretty that you feel great in, and that your husband will also love. Lingerie isn't all for the man, I think it helps put the woman in the mood too. One other thing that helps me is to read a good Christian book about why men need sex, and what it does for them. I applaud you for knowing that it is important for your husband and your wanting to fulfill this need for him. So even if you know that, it does sometimes really help for me to get the book out and read all the benefits my husband will get from it and then it increases my desire to give it to him.
The truth is, that I think it is just going to be hard for us while we have little kids. I feel like I get touched and needed all day by my children, and I am emotionally and physically drained by the time my husband comes home. I am hoping that as the kids get older, things will start to improve. Just know that you are not alone in this, there are others of us that are dealing with the exact same thing.
M.