I know a few families where your wifes behavior is normal. The husband gets shut down and learns to be happy.
I wouldn't say I'm happy with it. It's just that we have both learned to keep our differences about this completely seperate from all the other aspects of our marriage which work very well.
And I'm not sexually shut down by any means, except in the sense that I'm shut off from my wife. I know some men feel so rejected that their sexuality takes a hike, and they develop ED, etc. That was never the case with me, perhaps because the biological aspect of my drive has always been resilient. I'm ready for sex even when I have the flu and running a temperature of 102 degrees.
My advice for wives of HD men is that if you don't attend to their sexual needs, don't count on their sexuality to just subside. Rather it's like water -- it will flow elsewhere as sure as the sun comes up.
This is your body, after what I now know, I will not take a chance with my partner helping to possibly permenantly reduce my sex drive and any other biological and brain functions which tie to it.