Charlize Theron discusses sex education.

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Cameras follow Charlize as she returns to South Africa to meet with Dr. Michael Bennish and see firsthand how the mobile health units have been helping the students. Sex, teen pregnancy and HIV are taboo topics in South Africa, but counselors create an atmosphere in the units that allows open discussion. They also provide free condoms and HIV testing as key parts of their program.

"I don't think people understand that it's really taboo," Charlize says. "You don't talk about sex, you don't talk about rape, you don't talk about HIV." During their classes, the students are reminded that condoms cannot be saved once they are used, knowledge they will pass on to their community.

"Little boys thought you could wash a condom and reuse it," Charlize says.