One in four teens have been frightened by the violent attitudes of a person with whom they are, or have been, in a relationship, at least once in their lives, according to a report by Save The Children.

The report, entitled 'Just kidding.

New Evidence on Violence in Adolescent Relationships' and released before Valentine's Day, said 36% have faced violent language from their partner.

It added that one in three teens have been geolocated by their boyfriend or girlfriend and that 28% have had intimate pictures of themselves shared without consent.

The report said that over 50% of female teenagers have been harassed by sexual comments or advances.