I know there are different halachos for men and women who commit adultery. This is different; it’s viewing inappropriate content online. For all the men who were so understanding that’s he’s human, deserves support, and probably was lonely to start with, would they feel the same way if it was their wife who did this. Me thinks not!
I would not feel the same way about a woman.
I would not even suggest that they go to a Rov. There is (mostly) no problem with her viewing such images, and I would not consider it to be an issue with someone’s marriage. As everyone said, this is a Halacha issue, not an infidelity issue.