Some people believe that honking a car horn at a stranger, or yelling at them on the street about their appearance, is a surefire way of winning a woman over.
The global study by Cornell University and the campaign group Hollaback! has shown that catcalling first happens to most women when they are aged between 11 and 17 and still at school.
The study is the largest of its kind, with over 16,600 respondents from 42 cities across the globe.
Women in countries such as Argentina, India, Nepal, and the U.S. said that they had been groped, fondled, or taken different routes from home because of street harassment.
