Movinonup
To stray off topic ever so slightly re the affair first of all, keep well out of it. There are reasons why folk who are married (on both sides, or one side only) go into affairs and it's their conscience etc and for you not to bother about.
On the other hand, if this pair are cheating on the company by conducting their affair not only in company time, but on company premises, well that's another story! In our own time, out of hours and off the premises, we're entitled to do what we like - provided, of course, it doesn't infringe on any clauses in one's contract of employment! - but during company time, you owe your allegiance and concentration to the company. Sure, we all have the odd flirtation round an office - it makes the day go by, but not full blown anything else!
Jackie
www.iqps.org
Peer Moderator 
