Traffickers are often referred to as "Master Manipulators". They use a variety of tactics to recruit victims and pimps are many times classified as (1) "A Romeo" pimp or someone who portrays himself as a "boyfriend" who loves her and will take care of her, or (2) A "guerilla" pimp who controls through force.
The modern day pimp/trafficker initially seems like a very nice guy who cares deeply about their victims. Then the manipulation and threats begin. One of the most powerful ways traffickers keep their victims controlled is by the trauma bond that develops between the victim and trafficker. Victims are controlled by their pimp through repeated beatings, rapes, drug dependency, withholding of food and sleep, debt bondage, isolation, and psychological abuse, which can include threats against family or friends.
Sex trafficking is a high profit, low risk business with a relatively small risk of a pimp going to prison for human trafficking. Additionally, their "product" can be sold repeatedly, unlike drugs or weapons, where the product can only be sold one time. The faces of victims know no ethnic, religious or social-economic boundaries.