The ONLY time in three decades of working that I've ever seen a work relationship become a problem was when the editor of a magazine I worked for started seeing one of the junior reporters. Now, not being very sensitive on such issues, I didn't even notice until a few months after - when they told me! The real problem lay in the fact that the editor was expected to thrash out general policies for the mag with everyone, particularly with the deputy editor. Of course, people being as they are, she was going home and potentially chewing the cud with her new love interest - this thought, for that was all it was so far as the rest of us knew, did not sit well with the deputy and caused some stir. I'm not sure where this takes us, but I feel that in this instance it was made known, if only after a little bit of a delay, and we ought to treat adults as adults and assume they would not let something like this affect their work. I know from experience (not my own direct experience!) that someone will always know about people coupling up, so I don't think any contractual policies are really necessary. Just my view.