I made my vote assuming that "always" doesn't include minors or propositions made under duress.
Assuming that we're talking about adults choosing this profession purely of their own volition, yes, it should be legal.
It's really not that different from porn -- you just don't film the act.
"Chaos... isn't a pit. Chaos is a ladder. Many who try to climb it fail and never get to try again. The fall breaks them.
And some are given a chance to climb, but they refuse. They cling to the realm, or the gods, or love. Illusions.
Only the ladder is real. The climb is all there is."