I've been seeing someone casually whose relationship with his wife is over. He no longer lives with her, neither of them wish to be together and they plan to divorce.
I would never dream of having anything to do with a man in a relationship, married or not. Without really thinking about it, I had assumed that, since this man's relationship with his wife (if not his marriage) is over, that it's OK to be intimate with him.
However, a friend said to me today that, legally-speaking, because he is still married, I should stay away until he is officially divorced, since in the eyes of the law, this could be considered adultery and I could be cited by his wife as grounds for divorce! 
This seems absurd to me, but this happened to my friend, who started a relationship with a man nearly a year after he and his wife had parted.
Perhaps I'm completely naive - I've never been married, so parting with my ex-partner of 10 years didn't involve all this - but this hadn't occurred to me. I just thought: he's not with her any more, so morally, this is OK.
Is my friend right? Should someone still married (but no longer with their spouse) not get up to anything with anyone else, even if it takes a couple of years to get divorced? Could I be cited as a reason for divorce, even though I did nothing with this man while he was still with his wife? And even if I were to be, is it actually a big deal?
Argh! I thought I was acting with integrity, and now I'm not so sure, and I don't like the feeling.