Children as young as five are to get sex lessons in UK schools, in a bid to cut the soaring number of teen pregnancies.
The move comes amid a 12 per cent rise in the number of abortions performed on under-16s from 3,658 in 2001 to 4,113 last year.
But Margaret Morrissey of campaign group Parents Outloud condemned ministers for "infringing parents' rights".
And the move will be unpopular with church schools, especially the gay lessons.
But Balls said, "You can teach the promotion of marriage and that you shouldn't have sex outside of marriage, but you can't deny young people information about contraception outside of marriage.
The same arises in homosexuality."
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