The querist @ Ravi SK has posted that:
"wife Not willing to have s*x. this has been for last 3 years. The reason is as I don't want kids due to medical reasons hence she is rejecting with that cause. '
So,It is not the wife but the husband that does not want to have children from coitus with wife , in married life.
Querist @ Ravi SK has posted the reason also.
It might be possible to talk it out and resolve and let it not linger to point of 'No return'.