This same thing is happening to me... I've been "with" my husband since 1989, and one of the things that always attracted me to him was his smell.
Now, just in the last 2 or 3 months, his smell is DIFFERENT. Not bad, just not the same. He HAS started a new job, and is under a lot of stress. Could this do it? All over the web, there are people talking about people smelling oddly when they're sick. I don't THINK he's ill.
It's becoming a problem for us, in that I really have trouble being "near" him - to cuddle, to kiss, to make love. I don't recognize his smell, and I can't get turned on...
I am 38, he is 39. We have a 5YO son. WHAT DO I DO?