Personally I wouldnt get involved with someone married, so I dont really know, I imagine it to be - as you say - the forbidden thing and the fact it's commitment-free (although that can backfire on you). The thing that would put me off is the obvious guilt knowing they had a husband/wife and possibly children, a family which this would ruin if it was exposed. I kind of think of married men as no go areas.

__________________
"When I was 4 years old, they tried to test my IQ.
They showed me this picture of 3 oranges and a
pear. They asked me which one was different and
did not belong. They taught me different was
wrong."
- Ani DiFranco -