*News reports and public service announcements on South African TV estimate up to 100,000 people may fall victim to sex trafficking during the FIFA World Cup, which begins on Friday.

Concerned churches from across the globe are sending missionaries to the games to minister to sex workers and work alongside social services to help them.

There’s always been worry that the World Cup–such a huge, international event–will bring in customers to exploit local women and children, turning them into sex slaves, bought and sold as the property of pimps.

During the 2006 World Cup in Germany (where prostitution is legal), brothels expanded to meet demand so the estimated boost in sex trafficking didn’t happen. Some say that’ll be the case for this year’s and that the fear of “World Cup sex slaves” is just hype.