That's good advice for people _already_ in a relationship. I don't think that's good advice for singles. Outside of school (writ large) work is one of the places people get to know each other, socialize and mingle. It would be sad to see one of the main places people get to meet to be set "off-limits".
There is nothing mysterious. Just don't be crude. Don't buck convention. Know accepted social norms.
Oh goodness, why take that risk? Why would a single guy aching for sex start their hunt in the workplace? Your concept of what the workplace is for is really screwed up. Unwise. Foolish danger.
I have been told stories of companies with no-dating rules where inevitable attraction and secret love affair between coworkers led them to both quit in order to go public with their romance.
That's not what I'm talking about. Obviously, nature is powerful, and attraction between coworkers can just simply happen. I'm not talking about accidents, which are hopefully few and far between. I'm talking about conscious choices that men make.
It's not like there aren't equally convenient ways to meet women to those at work. If you want a (chaotic) hookup, get on Tinder or Craig's List or the local club. If you want the thrill of the meat market, try Match. If you'd like to get married, goto eharmony.
There is nothing mysterious. Just don't be crude. Don't buck convention. Know accepted social norms.