It is possible, but from what I've read, extremely unlikely.

Did she ever show an interest in sex?

Have you asked her (at a time when things are calm -- not in the heat of the moment!) why she declines and if there's anything you can change that would make her feel less like declining?

If you are serious about saving your marriage, you can't get it all on this forum. You've got to listen to the Marriage Builders Radio show, every day. Install the app!

Married to my radiant trophy wife, Prisca, 19 years. Father of 8.
Attended Marriage Builders weekend in May 2010

If your wife is not on board with MB, some of my posts to other men might help you.