It helps to keep those boundaries mentally, even if they aren't there physically.We tend to have friends at work; it makes sense considering we spend a lot of time with these people.
Dating a co worker
The first two times I dated coworkers, the relationships lasted more than a year each and ended in such a way that I could continue to work alongside them and even be social with them.
My bosses have always known about the relationships (which I think is crucial!
There's no gossiping about the date we went on over the weekend; no scheming with my coworkers about birthday gifts for my S. It's important that I not bring that intimacy into the workplace since they all know him.
Also, it's important to me to not alter their view of him as their coworker because of my experience as his girlfriend. It sucks having to watch your every move, trying to not make anyone uncomfortable or be unprofessional.
To get around this, I always try to leave work at work and home at home, so to speak.