The Sex Education Forum (SEF) says that the plans leave a gap in teaching about reproduction in primary school.
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Most states leave the scope of sex education up to the local school boards.
In a statement, Mr Knight said parents did not have the right to withdraw their children from the statutory sex and education part of the curriculum, only the optional PHSE element.
The criticisms came as it emerged that the church plans to keep the issue of sex education in Scotland's schools under the spotlight by raising concerns at this year's General Assembly.
For the past 25 years he served as Senior Research Scientist at ETR Associates in California, USA. Over his professional career, he published the most definitive systematic reviews on the effectiveness of sex, relationships and HIV education in schools and is widely recognised as the leading world expert on sex, relationships and HIV education curriculum standards.
Mr Albert also stresses that the reasons why teenagers get pregnant and carry a baby to term are much more complicated than the content of sex education lessons - and notes that many young people take no notice of what they are taught at school.
Appearing before the same committee, which has been set up to scrutinise the plans, Education Secretary Michael Gove was asked about the implications of legalising gay marriage for the teaching of sex and religious education in schools and was asked what protections there were for teachers who had moral and religious objections to same-sex marriage.
Mr Howard will also attack the Lib Dems for wanting to abolish faith schools, introduce compulsory sex education from the age of seven, and "give contraceptives out in schools from the age of 11".
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The Democrats want the federal government to impose policies regarding drugs, same-sex marriage, abortion on demand, sex education in the public schools, free birth control, etc. on the entire nation.
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Currently it is compulsory for all maintained schools to only teach the biological aspects of sex education.
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The government is being urged to change the law so that sex education books in schools are vetted by film censors.
BBC: Sex education books must be vetted for content, says MP
The MP recommended that books and videos used for sex education in England be given a rating by the British Board of Film Classification before they are bought by schools and local authorities.
BBC: Sex education books must be vetted for content, says MP
The arguments against single-sex education come primarily from civil-rights and women's groups who oppose publicly-funded segregation on principle.
Members of Planned Parenthood say the measure will lead to the censorship of material about sex education, AIDS awareness, and abortion.
The survey calls for more sex education for adults, given that about one in five participants said they had never had sex education in school.
Dr Leonard Sax, the founder of the National Association for the Advancement of Single Sex Public Education, even claims a neurological reason for his cause: girls and boys mature at different rates, so they need different teaching methods.
More inspiration comes from the Netherlands, where the rate of teenage pregnancy has dropped since sex-education classes were changed to let youngsters discuss the subject more openly.
The Education Secretary, David Blunkett, said on Sunday that he would be speaking to the Office for Standards in Education about evaluating the effectiveness of single sex teaching of some subjects in co-educational schools.
Tory MP David Burrowes asked whether parents would be able to take their children out of RE, sex education and other classes in the curriculum where pupils were "taught about the value of same-sex marriage".
Unveiling her ten minute rule bill on 4 May 2011, Ms Dorries called for schools to give girls aged 13 to 16 extra sex education, including the benefits of abstinence.
Most of us have had some sex education somewhere in the past, but nobody ever taught us how to have a constructive conversation with a partner about the sex we're having.
Koop shocked his conservative supporters when he endorsed condoms and sex education to stop the spread of AIDS. He carried out a crusade to end smoking in the United States his goal had been to do so by 2000.
The real battles on same-sex marriage, abortion, education, spending, labor unions, and, yes, the Affordable Care Act are happening state by state.
To counter their vulnerability, Miss Chen advocates sex-education programmes that convey not just the mechanics, but also the emotional and social aspects of sex.
It says Mr Stancik has been accused of being "a clever manipulator of the news media, more interested in sex crimes and sexy headlines than in the fundamental work of education".
Two-thirds of those still on the job say they will keep working after they retire, a plan shared about evenly across sex, marital status and education lines, the survey finds.
Groups such as the Family Research Council continue to advocate for abstinence-only education at the K-12 level, but the organization does not have an official stance on what sex education should happen beyond that, Sprigg said.
In China, unwanted pregnancies have been on the rise because of a lack of sex education and an increasingly lax attitude toward sex.
It has become a whole generation's sex education and could be the same for the next they are fumbling around online, not in the back seat.
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Sex education remains controversial on the state and local level.
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