• All six big internet providers to turn on porn filters by next year
• Households will have to actively opt-in to being able to access adult sites
• Prime Minister says couples will have to have a talk about internet use
  

By Matt Chorley, Mailonline Political Editor

PUBLISHED: 10:58 EST, 18 November 2013 | UPDATED: 11:00 EST, 18 November 2013

Husbands will have to have a difficult conversation with their wives about accessing porn at home, David Cameron said today.

The Prime Minister warned that new opt-in filters will mean that couples will have to decide between them if their internet access can be used to view pornography.

But he signalled that he thought families with children should opt to block access to adult material.

Mr Cameron today hosted a summit in Downing Street with search engine giants, internet service providers, charities and the National Crime Agency to tackle the spread of child abuse images online.

Internet search results linked to child abuse are to be blocked across the world in a stunning U-turn by Google.

The world's biggest media firm has agreed to introduce changes which will prevent depraved images and videos from appearing for more than 100,000 different searches.

Intelligence experts at GCHQ have also been drafted in to break the ‘dark web’ which allows paedophiles to share vile images online.

By the end of next year the biggest internet providers will require 20 million homes – 95 per cent of all properties with an existing internet connection – to choose whether to switch on a ‘family friendly internet filter’.

Filters have already been switched on by the six largest public Wi-Fi providers across Britain and hundreds of thousands of homes have already been opted in.

But today Mr Cameron was challenged over how couples will agree over web access, if a husband wants the filters switched off and a wife wants to block pornography.

The PM said: ‘Well, they’re going to have to have a discussion, aren’t they?

‘The fact is, I think what ought to happen here and what is going to happen now is when you sign up to an internet service provider, when you take out your broadband account, you are prompted with an online message which is there are these pornography filters that are switched on.

‘If you want to keep them, go ahead, particularly if you’ve got children in the house; if you want to take them off, you have to make an active choice. And I think that’s the right thing to do,’ he told BBC Radio 2.

‘Now, I had around the table with me Virgin Media, TalkTalk, BSkyB and BT, who between them account for almost nine out of ten broadband accounts in the country.

‘So I think this is real progress for people up and down the country, parents like me of three young children, who want to know that there are some limits on what your children can search for on the internet.’