Come have a look - its all quite out in the open and regulated. You've been fed a lot of christian/puritan propaganda, as well as a bit of just plain old press-hype. There's nothing here but a lot of women in their 20's and 30's (or older!) making good money. Once in a great while, if one is very lucky, one might encounter an 18 or 19 year old.. but it is a rarity.
And of course, SE Asia is also known as the AIDS capital of the world.
Been there, seen the massage parlors, and went back to my ship happy to know that I'm not bringing back one of the biggest killers of the modern world with me. There's more behind prostitution than just sex son. Maybe when you grow up and think of their consequences, you'll learn to understand why it is illegal/immoral. Just because "it's been done for forever" doesn't mean it's right.