Professor Dee said educationalists should "hesitate" before advocating more single-sex classes, which could have other "drawbacks".
BBC: NEWS | UK | Education | Male teachers 'better for boys'
He said the goal was never to create single-sex wards as this was not achievable.
It allows educational organizations to prohibit the opposite sex from participating in a single-sex contact sport.
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However, researchers have suggested that this is because they have high-achieving pupils, and not because they are single-sex.
Single-sex schools flourish in the private sector, and students who attend them do better than average in tests.
The arguments against single-sex education come primarily from civil-rights and women's groups who oppose publicly-funded segregation on principle.
Some hotels that originally instated single-sex units have since done away with them.
It has suspended the introduction of Holocaust studies in its schools, and has made all its summer camps single-sex.
Duke was found to be unable to claim the single-sex contact sport exemption.
FORBES: Caroline Pla, 11-Year Old Football Player, Discriminated Against By The Catholic Church
With enemies such as these, single-sex schooling is hard not to love.
Public schools are generally larger and don't offer single-sex or religious education.
Single-sex programs help children explore their identities during developmentally crucial years, said Dana Edell, president of SPARK, a nationwide coalition of girls-only programs.
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K-12 education has seen a boost in single-sex schools since 2006, when the Bush administration relaxed regulations on how public schools could implement it.
CNN: Augusta National a powerful holdout among men-only clubs
Much of the remaining two are spent resting, eating and watching television in one of the bridge's three single-sex lounges (a holdover from the early days).
In a survey of ex-pupils from girls' schools, the coalition says that a very high proportion believed that single-sex education had benefited them and given them greater confidence.
Furthermore, the study raised as its ideal the policy to which the Marines have adhered all along: single-sex basic training ("boot camp"), segregated barracks and tougher physical training.
Mr Bell said that reflecting these strong male images, girls can be less confident than boys in class - and he said some schools were experimenting with single-sex classes to offset this.
In the case, a jury found that Heather Sue Mercer, a kicker, was discriminated against by the Duke University football team, a program designated as a single-sex contact sport, for her gender when she was kicked off it.
FORBES: Caroline Pla, 11-Year Old Football Player, Discriminated Against By The Catholic Church
Private colleges are moving away from single-sex education as historically all-girls schools join forces with male counterparts or align themselves with bigger universities, according to Lisa Maatz, director of public policy and government relations for the American Association of University Women.
CNN: Augusta National a powerful holdout among men-only clubs
Mr Peckham also pointed out that two single-sex toilets - one for boys and one for girls - would need one man and one woman to supervise them, whereas the unisex facilities would only need supervision by one member of staff of either gender.
In Bradford acute in-patient care has been reconfigured to provide self-contained single sex units.
More than two thirds (69%) of the girls agreed that some types of families were treated less fairly, such as single parents and same-sex parents or parents who were not married.
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Then the two rival campaigns for and against single sex marriage give their thoughts - first, Out For Marriage then the Coalition for Marriage.
Gyllenhaal, often a distractingly tic-ridden actress who relies heavily on her sex-kitten sultriness, here shows unexpected backbone as a single mother coming to terms with her own bad habits as she takes yet another chance on a much-married man who's potentially crippled by his.
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.
This is not about patient care - this is about lack of resources for single sex wards.
The images promote the message that single people, unmarried couples, same sex couples, over 40s and non-home owners can all have roles to play.
In all, 37 states offered 160 ballot proposals, and the initiatives had no single unifying theme this November, unlike in 2004 and 2006, when voters saw same-sex marriage dominate ballots, according to the National Conference of State Legislatures.
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