The distinction between the two, again, is that generally folks in sex work are choosing to be there. It's a consensual occupation. Again, the reasons that people come to sex work might be varied. It might not be the choice that everyone would make, but we have to remember that these are choices people need to make to survive under the conditions we have given them in Canada.
The distinction between sex work and trafficking would be folks who didn't choose to be there, but with the emphasis that not choosing to be there doesn't include making survival choices.