Pornograhy websites are to be ordered to install age-verification software to ensure users are not under 18.
Sites face being banned in the UK if they fail to comply with tough new regulations set to be announced by the Government on Monday.
An estimated one million children access explicit websites each month, according to the NSPCC.
The charity warns pornography can give children a warped view of
relationships, increase "risky" behaviour, and create unrealistic
expectations of body image and performance.
Sites face being banned in the UK if they fail to comply with tough new regulations set to be announced by the Government on Monday.
Sex websites could require users to provide details from their credit card, which cannot be legally issued anyone under 18. Gambling websites already use a similar system.
The new regulator will tell internet service providers to block sites that do not take steps to prevent under-18s accessing pornography.
The Department for Digital, Culture, Media and Sport said it wanted all porn sites to have age-verification controls in place by April 2018.
Mr Hancock will formally begin the process with a written statement to the House of Commons on Monday.
Will Gardner, chief executive of internet safety charity Childnet, said: "Protecting children from exposure, including accidental exposure, to adult content is incredibly important, given the effect it can have on young people. Steps like this to help restrict access, alongside the provision of free parental controls and education, are key.
"It is essential to help parents and carers, as well as young people, be more aware of this risk and what they can do to prevent exposure and also to make sense of exposure if it happens."
Just under half of 11-to-16-year-olds and more than a quarter of 11-to-12-year-olds have viewed pornography online, according to an NSPCC report published last year. Researchers found children were more likely to stumble upon explicit sites that access them directly.
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