Let's go. Why should prostitution be illegal? Can you make an argument for your side without using the concept of "sin," or relying on metaphysics to make your argument? Your premeses are presumptuous and wrong. Understanding of sin and what you're calling metaphysics are rational, empirical, and reinforced throughout history.
Your premeses are presumptuous and wrong. Understanding of sin and what you're calling metaphysics are rational, empirical, and reinforced throughout history. In other words, no, you can't. Thanks for playing, though.