Principally at risk are women who are sexually active early in life, who have multiple male sexual partners, or who are having intercourse with a male partner who has had multiple sexual partners.
Visvairāk apdraudētas ir sievietes, kurām ir bijusi agrīna dzimumdzīve, sievietes, kurām ir daudz seksuālo partneru, un sievietes, kuru partnerim ir bijis daudz citu seksuālo partneru.