I've heard that after a marriage:
When a wife does a sin, the entire karma (100%) of that sin goes to her husband. When a wife does a punya, the entire fruit (100%) of that punya goes to herself only.
When a husband does a sin, the entire karma (100%) of that sin goes to himself. When a husband does a punya, the half of the fruit (50%) of that punya goes to his wife.
I am not sure how this can be true? In that case, if the wife commits many mistakes/sins, the husband accumulates papa karma unknowingly? How does the husband come out of this? What punya he should do to avoid this?