Would make it a less lucrative profession and therefore lead to less women making the choice for as it was said the "Easy money". These women make the amount of money they do because it is illegal. Imagine if they had to compete openly and it was readily available?? The prices would plummett and the lure of easy money reduced. Plus they would have to be very good and market well like other businesses. So the idea that it requires nothing but a "body" no brain would also be mitigated greatly.

The big bucks, violence and oppression comes from it being a black market commodity.
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"A Wise Man knows what he does not know!"