David Cameron is reportedly to announce a consultation into whether ‘opt-in’ filters on internet pornography should be introduced.

The Government has come under pressure from campaigners to introduce automatic filters that would make internet porn available only to adults who choose to ‘opt in’.

The Daily Mail, Premier Christian Media and the Safermedia campaign group have all been campaigning for the change.

A spokesperson for Safermedia said news of the consultation was “encouraging”, although the opt-in filter was being “fiercely resisted” by some internet providers and anti-censorship campaigners.

More than 80,000 people have signed a petition launched jointly by Premier and Safermedia asking for the opt-in filter.

According to the Daily Mail, Talk Talk is the only ISP to have offered a block on pornography to its customers.

A recent cross-party report warned that four out of five 16-year-olds regularly access porn on the internet and that one in three ten-year-olds has seen explicit sexual material online.

The report expressed concern that early exposure to pornography is damaging the ability of teenagers to form healthy relationships and leaving young people vulnerable to sexual abuse.

Safermedia founder Miranda Suit told the parliamentary inquiry last month: “This generation is going through an experiment.

“No one knows how they will survive this unprecedented assault on their sexual development. They are guinea pigs for the next generation.”