I've had an on-going affair with a woman at work for nearly two years now. We were equals at the time, but now she's a level above me. That's not such a problem except that she reports directly to people that are MANY levels above both of us. So she has a lot of influence.
To call a spade a spade, I'm her bitch. She's attached, so it's not as bad as it could be. However, there's no way I can end things and not get fucked over by her. If you haven't dated an attached woman, you may be surprised to find out that they can be more possessive than single women that you date. So, all other women at work are now off limits. We have some friends in common outside of work too, so I have to be careful about how I behave when I'm partying.
Don't get me wrong... she's very hot, and the sex is awesome. However, do I wish I had just kept it in my pants to begin with? YES!