Guys, the operative words were work and "sex". I did not say anything about love and marriage.
However, I will say I worked with my ex at the same place for about 10 years (before she was my ex) and it was doable, but I hope I never doable it again. Also, someone usually needs to leave if it breaks down. I am still there. Sometimes I am walking tentatively around thinking I will come down a hall, around a corner, and there she will be. Shudder
We have kids and a pretty good relationship, too, but no double shudder
Sex in the workplace is a whole other story indeed. And, it is very, very dangerous especially for a man, and even more so if a man and a manager.