This would sound the death knell for the sex slave industury and the drugs for sex rings. With a legal, safe and health checked no one would want to take the risk anywhere else. Prostitutes would gain legal recognition and become subject to many rights as yet unafforded to them. This is one uindustury that legal crack downs have never stopped but control and regulation would have a greater effect. Also it would prevent prostitutes claiming benifit while earning .
By legalising this it would bring it under government controll thereby regulating the industury and providing a tax revinue. In doing this prostitutes could be restricted to operate from licenced brothels in industrial areas. they would require to be licenced and undergo regular health checks.