Lizzie, that's not comparable - incest is against the law, cheating isn't.
Nobody is saying that it's ok to sleep with somebody married, it isn't. It has huge potential for hurt and upset and, I personally think that if one had a crystal ball and could actually see the outcome of many of these affairs, they wouldn't engage. The thing is, people always think they won't get caught.
Separately, prisons are full of people who thought they wouldn't get caught. It's a human condition perhaps?
Wilding, is anybody saying that any party cheating is faultless? I don't see that they are - just that the responsibility lies with the married man who chooses to break his vows. That's what hurts, the knowledge that the man who elevated you (general) to be his one and only, disregarded that. He is completely culpable for that, he has the relationship with you. The OW does not. Whatever you may think of her, she owes you nothing.
There are plenty of people who act like 'dicks' outside of affairs. It's only really affairs that seem to light the blue touch-paper though and it is ALWAYS the women who get blamed.
If this thread had been left to run without posters pointing out the blindingly obvious (married man at fault), I can see it would have turned into an absolute shitstorm of abuse towards the OP because she is the OW in this case. It was telling yesterday when PotteryGirl suggested 'a few posts berating men' - because in her mind, that would have made the OW-bashing 'acceptable'. It isn't.
Men are still holding all the cards and are busily making up 'new' ones. Women don't do themselves any favours by allowing themselves to be divided and set against each other - we're already 'ordained' that way (see excellent posts above).
As for feminism, I don't understand very much about it, I'm sure that most of my views are very unfeminist but at heart, I'm a woman's woman and my priority is for women however much I might disagree with individual women.
I don't think anybody here is claiming to be any kind of expert or spokesperson for all females or feminists either.