You don't have to wonder, it's a scientific study. https://clinicaltrials.gov/show/NCT00543543

Sponsor: Merck Sharp & Dohme Corp

Official Title: A Randomized, International, Double-Blinded (With In-House Blinding), Controlled With GARDASIL, Dose-Ranging, Tolerability, Immunogenicity, and Efficacy Study of a Multivalent Human Papillomavirus (HPV) L1 Virus-Like Particle (VLP) Vaccine Administered to 16- to 26- Year-Old Women

Health Authority: United States: Food and Drug Administration