I would suggest you get your hormone levels checked. Our hormones change as we age and if they are not working properly you will have a loss of sex drive. The other thing I would say is if you take any medication, that could be the problem as well. These are all things your doctor can tell you.
Your case is a tough one. I can't imagine not having a sex drive. Speaking as a male, I would place sex in the top two or three reasons for getting married. If it was just you, as a single, then it would not be a problem, of course. You say you are "happily married to a wonderful sexy latin man", so it sounds like you are fine, but you are troubled about how this is affecting your husband, and therefore your marriage, because your husband is on a different page--he is a "sexy latin man". I would suggest some kind of psychological counseling for you to possibly get behind your feelings on the subject, as it doesn't appear to have a physical basis. Otherwise, at least, if you can, you should try to keep your husband satisfied by going through the motions, taking your time, with as much variety as he wants and/or you can think of, and maybe your sex drive will catch up with the physical aspects involved, whether it be doing a blowjob, handjob, anal, "69", or whatever.