How do you learn about libertarianism? Either you think you have the right to control other people or you don't. There is no "learning" in my opinion. He thinks the war on drugs is a personal issue but prostitution isn't. How can you acccept one and not the other when in the end they're the same thing?
Prostitution is a little bit different in that sometimes women are forced into it. That's probably about the only difference though.