The men were filmed laughing and wolf-whistling the dancing women as they went wild in their glass enclosures but, as it turns out, not everything was as it seemed.
Watch the video for yourself below:
Every year, thousands of women are promised a dance career in Western Europe. Sadly, they end up exactly where these men stumbled across them - in the red light district.
An estimated 9000 people have been trafficked - tricked, forced and exploited - into sexual exploitation in the Netherlands.
That includes men, women and, most heartbreakingly of all, children.
This awareness campaign created by Duval Guillaume Modem definitely looks like it woke those men up to a horrifying reality - and, with over 9 million shares, it looks as though the video will go on to educate many more.