Adolescence
The incident took place on board a London night bus in May.
A 27-year-old man has been arrested on suspicion of conspiracy to murder, police said.
The HPV vaccine could prevent more than 100,000 cancers in the next 50 years, estimates the University of Warwick.
The teenager is also charged with sexually touching a child under the age of 13.
A 37-year-old man and a 34-year-old woman will appear in court on Monday
Grooming and child sexual abuse seems to have one final taboo: boys being abused by women
The teenager was arrested on Friday.
The document told children they must keep cuts hidden under their sleeves.