Dr. Berman's next question is a big one—have Courtney and Pierce discussed what they will do if she gets pregnant? Pierce says he would leave the decision up to her, but Courtney says she can't even think about it. "I'm scared to even think about that because of how big of an impact it would be on my life," she says.

In fact, one-third of girls in the United States are pregnant by the age of 20—which is why Dr. Berman says it's a possibility Courtney needs to face. "You have to go down that path and think about it. That's one of the homework assignments before you have sex," she says. "It doesn't sound like that piece of the puzzle has been solved yet."