I guess Catholics don't take Jesus' teaching on sinning in the heart and thoughts as being actual sin as if it were done, seriously.
He said that if a man looks on a woman to lust after her in his heart, he has already committed adultery with her.
It's the INTENT of the Law that counts as well as the outward keeping of it.
That probably also explains why Catholics are capable of thinking that they are pretty good at not sinning during the week.
I couldn’t believe someone would make a comment like that. She is sinless but erred???