(William B. Plowman/GETTY IMAGES)

During the same time period, Stein says, “there was a 6 percentage point increase in the proportion who used a condom in combination with a female partner’s use of a hormonal contraceptive.”

The research comes from The National Survey of Family Growth, which surveyed 4,662 teens ages 15 to 19 between 2006 and 2010.

It also included information on who teens chose as sexual partners.

“In most cases, teens had sex with someone with whom they were ‘going steady,’ although 16 percent of the girls and 28 percent of the boys had sex with someone they had just met or with whom they were ‘just friends,’” Stein writes.

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