sexedA charity is calling for sex and relationship education in schools to be updated so young people can make responsible, well-informed decisions about their lives.

Change.org is campaigning to bring sex education into the 21st century – to reflect the influence of the internet among young people.

A Telegraph/NSPCC poll has found almost a third of young people believe porn dictates how to behave in a relationship. Despite this statistic, current sex and relationship education guidelines, which teachers use to plan lessons, were last updated in 2000. There is no reference to the internet, mobile technology or online bullying.

The deputy prime minister Nick Clegg has agreed that sex education needs to be rewritten for the digital age. He said: “The last time the guidance was changed was 13 years ago and the world is a very different place now and in many respects it’s a more liberating place, not least because of the internet, but it's also a more menacing place particularly, but not only for young girls.”

So far the Department of Education has so far refused to change its stance on updating the guidance, even though the campaign has support among many politicians of all parties, as well as leading children's charities, including the NSPCC and GirlGuiding UK.

For more information, and to sign the online petition – which so far has more than 50,000 signatures, visit www.change.org/bettersexeducation