Working what god gave you

Not exactly a topic of recent conversation I know, but the other day I was watching the classic “chick flick” pretty woman. Probably not what most people think when watching the film, but the thought struck me, “Why exactly is prostitution illegal”? If a woman, or man, over the legal age of consent enjoys the activity of sex and chooses to engage in it in order to support themselves financially, whose business is that other than the two people involved? What, other than a camera, is the difference between the illegal activity of prostitution and the legal one of porn? Both involve two (or more) consenting adults having sex without necessarily having the emotional involvement of a pre existing relationship, and being paid to do so.
Surely if legalised, prostitution would be much less likely to be used as a method of controlling young and venerable people, or people with drug problems? It would also mean that standards could be put in place with regards to testing for AIDS and STI’s etc. Many other countries throughout the word have legal prostitution and although it may not be a vocation that will eventually lead someone to into becoming the PM, neither are many others out there. The freedom to choose what we do with our body is a basic human right, if you can earn a living whilst doing this then I say, why not?