Most of the time an acquaintance is fully empowered to tell you to fuck all the way off if you make an unwanted advance. And their life goes on as normal afterward. The equation is vastly different if people are coworkers, especially if there is any sort of difference in authority, seniority, connectedness, or anything whatsoever on the line (deals, employment, career advancement, mentoring, opportunities, etc.)
Even something seemingly as banal as interactions between coworkers who are perfect peers with the same level of seniority and authority in a company and work under widely separated management structures is potentially problematic. Because of the pressure to "not cause a scene" or "not hurt anyone's feelings". As I said, it's not about not doing it, it's about being absolutely, positively ensuring that everyone is 100% fully empowered to respond to an advance with absolutely zero fear of any negative repercussions no matter how minor.
Sure, many marriages are made between people who met through work, but many people already follow these rules, it's the people who don't that are the problem. Ask all of your female friends, if you have any, how many of them have been sexually harassed in some way at work. I don't have a single female friend who has not experienced it, because it's absolutely ubiquitous. That doesn't mean every guy in the workplace is doing it, it means that it continues to be tolerated and ignored enough in the workplace to make the few who do it be able to harass a huge number of people. It has to stop, and the way it stops is with changing the norms of what is expected behavior.