I would absolutely not accept that kind of behavior in my marriage, I don't care what the motivation. It is not acceptable. If he's lonely or unsatisfied or whatever, he has many better, honorable, constructive ways to handle that than screwing around with someone else on a computer. Why a woman would accept cheating in any form is beyond my comprehension. It is an insult to her worth as an individual and is demeaning of their relationship. It seems tantamount to accepting abuse from a partner because "they really didn't mean to hurt me".