For the sake of those who are unaware, it's prostitution.
While this profession has a bad reputation, there are lessons we can learn that are relevant to your business. After all, there's a reason why it's the oldest profession while many other professions do not last.
1) Need, Want and Desire
There's a need, a want and a desire.
Do your business serve a need, but not a want and a desire? Or do your business serve a want, but not a need and a desire?
2) Getting Attention
These people are better at getting the attention of their potential customers than any schooled and experienced marketers in big corporations.
3) Paying Attention
These people will treat their customers as the most important person in the world by giving them their full attention.
P.S. I live near Geylang, the famous red-light district in Singapore. Passing through this area every day does open my eyes to learning something.