How do you figure sex work is so different from other work that it becomes "buying human beings"?

I could see how it would count as renting people, but then that's pretty much what work is.

And as far as I'm aware human trafficking is not becoming more normalised, if anything it's the opposite. It's still as unacceptable as ever but I'm hearing more of it in recent years, i.e. it's more and more considered a problem rather than something that just happens. And that's coming from a country were it's legal and regulated.