safe sex

When the U.S. Food and Drug Administration approved the first vaccine to protect against cancers caused by certain strains of the human papillomavirus, or HPV, public health advocates cheered its arrival and life-saving potential. Unfortunately, the new vaccine quickly became embroiled in a debate over whether immunizing young girls against HPV, a sexually transmitted disease, would lead to risky sexual behavior. A new study, however, finds that the vaccine is not associated with an uptick in STDs — an indicator that HPV immunization does not promote unsafe sex. To conduct the study, which…