In a statement, David Laws, the education minister, has said "age-appropriate" sex education should be taught to primary school children from the age of seven.
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He also revealed that the Liberal Democrats have long been pushing for this to be the case, but that they had been met with opposition from the Conservatives.
Laws said: "We have long made the case, both inside and outside government, for updated sex and relationship education to be taught in all schools, including academies and free schools, but it is not something the Conservatives are open to."
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He added: "We believe that by educating children about sex and relationships in an appropriate way, we can help them to make informed choices in their personal lives. Currently, academies and free schools have no requirement to teach sex and relationship education, depriving children of important life lessons.
"The Liberal Democrats are committed to ensuring that children have access to age-appropriate sex and relationship education regardless of where they go to school."
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The Lib Dem plan would see primary school pupils receiving age-appropriate sex education at key stage 2, from the age of seven - but do you think this is a good idea?
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Do you think that 7 is the right age to start teaching kids about sex and relationships?