I'm sorry to say this, but this really sux. It could be psychological or he could've turned asexual (if such a thing is possible).
This is one of the reasons I advocate exploring sexual compatibility before marriage, to avoid issues like these. Now it looks like you are stuck with it
Don't cry, don't regret and don't blame
Weak find the whip, willing find freedom
Towards the sun, carry your name
In warm hands you are given
Ask the wind for the way
Uncertainty's gone, your path will unravel
Accept all as it is and do not blame
God or the Devil
~Born to Live - Mavrik~