Teenage girls are under growing pressure to look like porn stars because of online pornography, according to a disturbing warning yesterday.

Pupils as young as 13 are being pushed to conform to an ‘extreme’ porn-star aesthetic, it was claimed.

The alarming comments echo concerns raised by MPs, children’s charities and the Daily Mail over the damaging effects of easily accessible web porn.

Girls feel pressured to look like porn stars due to the widespread availability of adult material online which is accessed by teenage boys (file picture)

Helen Porter, a science teacher at an independent girls’ school, said: ‘The desirable body image has become more extreme.

‘They are all trying to have a narrow waist, long, slim legs and big boobs.

‘That’s the desirable thing. Girls and boys are viewing more pornographic images.

Young men are developing unrealistic expectations thanks to pornography, it has been claimed (file picture)

‘The boys are seeing these porn stars and saying, “I’d like to have a girlfriend who looks like that”.

‘We need to educate them to realise that, for most people, this is not achievable.’

Mrs Porter called on MPs to tackle the problem of ‘readily available pornography’ seen by children on the internet.

The Daily Mail has been calling for tough restrictions to protect youngsters. David Cameron has promised that new computers will automatically be fitted with web filters unless parents specifically lift them – but has not said when this will happen.

The ease of access to online pornography has been blamed for a huge rise in the number of under-18s reported to the police for sex offences.

In the past three years, the total topped 5,000.

This month, the NSPCC revealed that some as young as five have been questioned. The charity blamed online images for warping their ideas about sex and relationships.

This year, a 15-year-old boy was jailed for three years for raping a 14-year-old girl while trying to re-enact scenes from sadistic porn films he watched on the internet for hours every day.

Mrs Porter said it was ‘deplorable’ that teenagers were increasingly obsessed with body image and comparing themselves to celebrities.

The Mail has campaigned for strict regulation on adult material online

Girls begin to feel pressure at around 13 or 14, when they show an interest in boys and worry about what they ‘like and expect’, she said.

Mrs Porter is putting forward  resolutions at the annual meeting of the Association of Teachers and Lecturers next week.

She wants its leaders to investigate pupils’ easy access to porn and give guidance on ‘sexting’ –where explicit texts or pictures are sent on mobile phones.

Mrs Porter, from St Gabriel’s School in Newbury, Berkshire, is also urging colleagues to promote healthy body images among pupils.

Some girls ‘mark each other out of ten each day on how they look’, she said.

‘They need to be able to accept themselves for who they are,’ added Mrs Porter.

This month, former children’s TV presenter Floella Benjamin, a Liberal Democrat peer in the Lords, said girls were becoming increasingly sexualised.

More and more boys were treating them as little more than ‘sexual objects’, she added.

Teacher leaders also want new official policies to combat the problem of increasing sexual activity among pupils.

About 1.5 million adult Britons have stumbled across child porn while browsing online, said the Internet Watch Foundation, but 40 per cent do not know how to report the problem.

Read more: Daily Mail UK