or do you just think you wouldn't because you have never been in the situation yourself?
I'm, of course, referring to the post by rubyrose.
On the subject of having an affair with someone who is married. I just don't think it's as black and white as saying you shouldn't do it. At the end of the day, if a couple aren't happy (married or not) then things are likely to happen. In an ideal world, that relationship would end before something else happened, but this world is far from ideal.
My guess is that the majority of people who are high and mighty about it have never been in the situation of any unhappy relationship, or meeting someone you click with who unfortunately is taken. So you are all very lucky.