It's still abuse, for money. And consent does not mitigate the fact that people would not do it if they REALLY had a choice.
The same could be said about every establishment that sells alcohol. It's destructive and has the potential to kill, including individuals who are just minding their own business.
Still yet, there is an age limit on it and penalties attached for endangerment (in the case of prostitution).
IMO, this is more about one gender wishing to control the other ... when in reality, all they need to do is control themselves.
Why do you think there is so much focus on the "whore" rather than the *whoremonger/john*?
One cannot exist without the other.