Of course it happens. But if a man lied to her wife for years, people usually don't say "Well, it's all good because he did it for the children"; in that case we rather empathize with the shocked and hurt wife.

In this article, though, the Dr. stated that this kind of deceit was OK when done by women. I really don't think she would be OK if it was done to HER by her husband... — so, double standards again?

Regarding the last part of your comment, I think it's double sided: sometimes we don't want to see the red flags; but sometimes people are so good with their masks, the "revelation" really comes as a shock.