Every year, thousands of Filipino women travel to Japan.
They work in so-called hostess clubs in Tokyo.
But according to the US government, they are victims of sex trafficking.
Rhacel Salazar Parrenas is the author of "Illicit Flirtations: Labor, Migration and Sex Trafficking in Tokyo.
She spent months working in a hostess club in Tokyo.
Perrenas speaks with host Lisa Mullins about her book.