I recommend you both read either (or both) of Christopher West’s books:
Theology of the Body for Beginners
or
Good News About Sex and Marriage.
I found these extremely helpful to me on this subject.
The former has some interesting base information I found helpful to my faith enhancement.
The latter covers things differently but is an easier read.
That said, marital relations are important (as the books will explain) and that this issue is really a matter of faith. Your’s and your spouses’.
Please do not be upset with your wife. She may be frightened. Now is the time for love and patience.
Sorry if this is a repeat… I did not have time to read all the posts.