LONDON — One in ten British teenagers aged 12-13 years old are worried they're addicted to pornography, according to a new survey published Tuesday.

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It also found that one in five said they’d seen pornographic images that shocked them or made them upset, while 12% of this age group said they had made or been part of a sexually explicit video.

The poll carried out by NSPCC Childline surveyed 700 12-13 year-olds in the UK, it was part of a wider survey of 2,000 children between 11 and 17, conducted last month.

Childline said it has heard from children who say watching porn has made them depressed, given them body image issues or made them feel pressured to engage in sexual acts they weren't ready for.

“I'm always watching porn and some of it is quite aggressive," one teen told Childline.

"I didn't think it was affecting me at first but I've started to view girls a bit differently recently and it's making me worried. I would like to get married in the future but I'm scared it might never happen if I carry on thinking about girls the way I do.”

The organisation is calling on people to talk openly about pornography, saying that if we shy away from it as a society we are failing thousands of young people. It also launched a campaign, Fight Against Porn Zombies, to educate people.

The findings in this survey follow a 2013/2014 study, published by the charity ChildWISE, that found that Pornhub was among the top five favourite websites of British boys between the ages of 11 and 16.

Addressing the pressures facing teenagers, the government announced that school children in the UK will be taught about sexual consent from the age of 11 onwards.

Announcing the plans earlier this month, the lessons will be taught in mixed and single-state state and independent schools as part of Personal, Social, Health and Economic Education.