HPV (Human Papilloma Virus) is the virus which causes Genital Warts and can lead to oropharyngeal, penile, anal and cervical cancer. At this stage all cis females are vaccinated against the most pervasive strains of HPV at age 14. The idea is/was that as those cis females grew older they would immunise the men they had sexual relations with. What the government did not account for is the number of men who exclusively have sex with men and trans individuals who had transitioned after 14.