Winnipeg, Canada (CNN)Samantha Folster and Gilbert Fredette walk into the high school classroom and quickly launch into an uncomfortable conversation.

"Good morning everyone," Folster begins. "We're here to do a presentation with you today on sexual exploitation."
The room quiets, the teenagers sit at attention, all eyes on Folster and Fredette. It's a tough subject for 10th and 11th graders, but many of them have heard it before.

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