It really depends on the type of job, company size, hierarchical relationship etc. I've dated at least a handful of people I worked with, but not at every job either. Sometimes it's just the best way to meet someone. I've never had any big drama issues, but I tend to avoid drama and dramatic people altogether too.
That said, I was careful and selective about it. Sometimes there were women I was flirtatious with, but never got the courage to blatantly go after or they were involved at the time and nothing ever happened.