"Because your DH would have had every right to throw you out having found out what you had done. And that would have meant you would not live with your children anymore. Just because you wanted an affair with the OM."
That is bullshit. There is no way in the eyes of the law that the OP would not be entitled to live with her children in these circumstances. We are not living in Saudi, unless you hadn't noticed. Also, her husband does not have a legal right to throw her out of the home. Sorry, but what you have posted is plain wrong.
"And the married men who have affairs tadpoles? Or is it just women who are so saintly that they must have been driven to it? If there are men around who can't keep it in their trousers (and we know there are plenty), doesn't it stand to reason that there are women like that too?"
No doubt there are. But I think that women probably have affairs for other reasons than the 'thrill' of it.
Still curious - why did the OP have an affair - boredom, fell out of love, not getting any sex at home, lack of intimacy, wanted to test the water to see if she was still attractive to other men, doesn't fancy husband any more, can't stand being monogamous any more, fell in love, pure lust, sexual adventure. A combination of all of them?
Also, we do not have the full picture - perhaps DH has a few skeletons jangling around in his closet too? Friend of mine had an affair to escape from her hideous, selfish, verbally abusive husband. Not necessarily the best escape route but it served a purpose, at least it got rid of him. He is now busy making wife number 3 miserable (probably shagging around too, he is such a hypocrite, but loves to play the 'cuckolded husband' victim card.)