An 18-year-old girl presents to her nurse practitioner for a wellness visit and immunizations prior to entering college. She wants to know when she needs to start having Pap smears. What is the most appropriate response by the nurse practitioner?

"Are you thinking about getting on the Pill?"

"Pap smears are recommended starting at age 21 or within 3 years of sexual activity, whichever comes first."

"You don't have to worry about that; I know you aren't sexually active yet."

"Why? Have you started having sex?"