Giant sporting events can produce an economic boon to the host city, filling its bars, restaurants, and hotels. And the uptick in business for prostitutes can be staggering. In Brazil, where the World Cup will be played next year, the prostitution trade group is offering free English classes in anticipation to the demand:

 “English will be very important to communicate with clients during the Cup,” Vieira said. “They’ll have to learn how to work out financial deals and also use a specialized vocabulary with sensual words and fetishes.”

Vieira said that 20 prostitutes had already signed up, but that she expected at least 300 women to participate in the classes once they started.

But many of the women working are forced into it against their will, kidnapped by modern-day slave traders, human traffickers. And it’s not just in Brazil.

On Sunday, when the 49ers take on the Ravens (alas, no Tom Brady this year), there will be a steady uptick in prostitution in New Orleans. The Catholic Archdiocese of New Orleans teamed up with the city and the owners of the Saints to produce this PSA: