Education Secretary Justine Greening has pledged to modernise sex education in schools
Miss Justine Greening said the world has "changed immeasurably" since the last Government guidance was published in 2000, adding it was important fresh guidance reflected the world as it is today.
Her comments came as she faced fresh calls to make sex education compulsory, with senior Tory MP Maria Miller warning that children were being let down by the current system.
However, fellow Tory MP Philip Davies said there was a "worrying trend" from left-wing politicians to ban things or make them compulsory, as he stressed the importance of choice for parents.
The kinds of ways in which children learn about relationships is very different.
Responding to a question from Tory MP Ben Howlett (Bath), Miss Greening said: "He sets out the very serious point that the world has changed immeasurably since 2000, and the kinds of ways in which children learn about relationships is very different.
"At the moment, the challenge is that they're learning about them through all sorts of ways that give them a very skewed, inaccurate view of what relationships are about.
"I think it is important that we now look at how we make sure the guidance genuinely can work in reflecting the world as it is today, and therefore giving ourselves and our children a better chance to get the education that they need."
The Women and Equalities Select Committee has led calls to make sex education compulsory
The Women and Equalities Select Committee has led calls from a number of parliamentary committees to make sex education compulsory.
Committee chairwoman Miss Miller told MPs that data published by children's charity Barnardo's showed a 73 per cent increase in reports of children sexually abusing other children.
Miss Miller added: "We know children are not being affectively taught in our schools about mutual respect, self-respect or consent.
"Will the minister consider particular amendments which address those issues as part of the Children and Social Work Bill, because we're running out of time here and we're letting children down?"
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MPs argued children 'are not being affectively taught about mutual respect, self-respect or consent'
In reply, Miss Greening said: "Since the guidance was drafted in 2000 a lot of time has elapsed and the world is a very, very different place.
"It is now time that we look at how we can make sure that not only children have the right access to what I might rename relationships and sex education, but in the end that that is high quality as well.
"That's why I think we're right to make sure the next steps we take on this are the right steps, but ones that can for the long-term really move this forward and make sure that young children in our education system today are genuinely leaving school with not only the relationships education they need, but the broader life skills they need in order to be successful."
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The way in which youngsters learn about sex and relationships has changed
Shipley MP Mr Davies, a member of the Women and Equalities Select Committee, said: "There's a worrying trend in this House amongst people of the left, on both sides of the House, that things that they don't like should be banned and things that they do like must be made compulsory.
"What's wrong with the principle of freedom?
"And what's wrong with parents having a role in deciding what's appropriate for their children to be taught?"