What HKz says.
A workplace romance is a very common thing (actually, in my country it's the #1 place where couples meet each other!
), and it can work out very well indeed. You already have quite something in common which is very important in one's life (if it's a serious job I mean), you work together, you go to the same social meetings, etc. From my time working as a PhD student in a university lab, I remember AT LEAST two couples 'meeting' one another while staring down at their respective test tubes, agar plates, & DNA blots - both of them couples now married-with-children for over 20 years.
Perhaps it makes a difference if you're just out for the 'pussy hunt' in stead of looking for a steady relationship, I dunno.
But these folks didn't know it was as serious as it would turn out to be either, when they first became drunk together at a promotion party...