Will teenage girls have more sex?

• Position: Human papillomavirus vaccine - Brief article

Adolescent girls who are vaccinated against human papillomavirus (HPV), a sexually transmitted virus that may cause cervical cancer, are not likely to engage in sex more often than adolescent girls who are not vaccinated, according to a study by the University of North Carolina, Chapel Hill. Another study by the same researchers shows that about one in 10 parents is concerned that vaccinating children against HPV will encourage them to have more sex.

In 2006, the Food and Drug Administration approved the HPV vaccine Gardisil for use in females nine to 26 years old, launching intense debate about inoculating young women against a virus transmitted by sexual contact. "One of the main arguments against vaccinating young women for HPV is that they will somehow compensate for the vaccine's protective nature by having more sex," explains Noel T. Brewer, assistant professor of health behavior and health education, who led both studies. "Our findings say otherwise."

To understand how the HPV vaccine may affect sexual behavior, Brewer studied Lyme disease...