A few years back Rhode Island accidentally legalized prostitution. They managed to "fix" the law a few years later, but the fixed period of legalizing the oldest profession gave researches a nice window to study the connection between STDs, legal prostitution and rape. The results speak for themselves.
The gonorrhea rate among women declined by 39 percent.
The number of reported rapes went down 31 percent.
This surprised researchers so much that they re-examined the data using three different statistical methods - and came to the same results each and every time.
The other side effects they discovered were that more white and Asian women became prostitutes and that the prices for sex services declined. At the same time there were fewer prostitutes working the streets and more from their homes or hotel rooms.
Interesting data in the argument over legalizing the oldest profession.