It's just when I pragmatically think about solutions to the very real problem of human trafficking, banning sex-work seems like the least effective thing to do. And what constitutes sex-work? Any sex where payment is involved? Any sex act outside of marriage?

Human trafficking is already illegal. Fund investigators and get rid of traffickers.

Empower sex-workers instead of banning the practice, because it will still happen but just more in the shadows. Bring it to the front and truly regulate it.