how many of you are in a happy marriage but find something important lacking?

i've asked this question before and have received some pretty judgmental answers. i am in a strong, relatively happy marriage. we have lots in common but my husband just doesn't have the interest in sex that he used to have. he is healthy and will never turn down my advances but just won't initiate it. i do what i can to make things easy for him at home, i am healthy and fit, i still love sex and since i initiate it i don't go without but it is hard to feel like he could live without it. i'm not going to end the marriage but i am curious how many of you have had to settle for a lot less passion than you hoped for?