It was one of a string of revelations in the survey carried out by the Family Planning Association (FPA) at the start of Contraceptive Awareness Week.
They reveal "widespread confusion and misunderstanding" about some of the basic facts, said the FPA, which has called for improved sex and relationships education in schools.
"In today's sexualised society, we are bombarded with a multitude of sexual imagery and messages," FPA chief executive Anne Weyman said.
"Nevertheless, providing people with the information and skills they need to make positive choices about their health and lives is not considered a priority."


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