I have jacked off a couple times at work....it was actually pretty cool. There are actually two building that connect where I work. I always go to the bathroom in the other building and I thing a guy caught on to what I was doing. A couple of times I have seen him on the way and a few minutes later he comes into the bathroom and slowly walks by my stall and looks in...hahaha. Maybe it is just random? I use to stop when he would walk by, but one day I got the balls to just keep stroking. I acted as though I was looking down at my cock and I noticed he stopped and looked a bit longer. I just kept jacking off then slowly looked up and caught his eye. I just smiled and he seemed a little scared I had caught him. Oddly enough he continues to come into the bathroom when I do.
I have also had sex in the office. Of course while no one was there, but there is always the chance of the cleaning people coming in. I think becuase you are a little scared it makes the sex really hot. The good thing is that if someone is coming you can always hear the keys!