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The waning fear about the spread of HIV and AIDS among heterosexual youths has contributed to the decline in instruction, says John Santelli, a professor at the Mailman School of Public Health.

"The bottom line is the size of the American family has changed a lot over time," said Dr. John Santelli, a professor of population and family health at the Mailman School of Public Health.

The new report highlights the need for more research on new technologies, said Dr. Guohua Li, a professor of epidemiology at Columbia University’s Mailman School of Public Health in New York City.